Workflow sd letterbox to 16:9 hd through iohd?

Question

Hi.  Let me preface this with saying I've waited three years to be able to do the following workflow to get a hardware upres of my feature film affordably as using a teranex etc. was out of reach for me and I didn't want to throw my money away on editing houses when I preferred to acquire equipment and do this on my own...first I lucked out with getting an iohd on ebay, and then someone at b&h kindly told me about the ninja that had been invented and that I signed up and patiently waited for production on...this week I got a secondhand hdv recorder so now I'm ready to go.  I was told along the way that I couldn't do this without a lot of money or a software alternative upres that wasn't acceptable for me...and I came up with this workflow but I have one last bug I'm wondering if any of you out there can help me with!
The original film was shot on a dvx100 in 4:3 and letterboxed.  The file that I edited, and later could see output through my iohd to hd image on my flat screen as one of my monitors...I now plan to capture on the ninja as a pro res 422 hq file that I'll then throw back on fcp for preparation for hd files, one of which I'll output to an hvr-m15au as hdv1080i or 720p!
I have prepared various files and realized the ninja recognized the files uncompressed at 8 and 10 bit and not in rgb (?) when output from the iohd through hdmi...so I have ready uncompressed letterbox and uncompressed anamorphic set-up for digibeta or just 720x480 rather than 720x486...but I've decided on choosing the file I had ready for digibeta which seems to match the specs closer for hd.
The aja output is in 1080i 29.97 (for some reason the ninja only recognizes the signal as 59.97) and/or 720p 59.97. 
But HERE'S MY QUESTION! 
I get, of course a full screen capture of my anamorphic file that can then be recognized on the digital tv as 16:9 if I choose a "full" setting...is this the best solution considering the original source if I want to have at the end a full 16:9 picture onscreen...or is there a way to do all this and have a true 16:9 and at what point in the workflow would I do this "cropping" and if I do that am I back to square one with deterioration of image??????  I do have broadcast opportunities down the road with a distributor who is still pitching my film in its sd format and as well...I'd like to also fiddle around with blu-ray authoring on my own once I capture these files.
I'm also a little perplexed as to why I'm not seeing the stretched files on the ninja monitor out of the iohd when I choose the stretch options in the iohd which would solve the problem but that's not what's happening.
Thank you for your input or multiple suggestions on this...and for the naysayers out there who have said "why bother upresing at all"...you'd have to see the finished film output as hd on a monitor to know that answer and to recognize the reality that people will choose download or buying hd product or blu-ray, not to mention the broadcasters who want deliverables for some platforms on hdcam or other hd formats...and love of full screen ability of picture...the iohd is a wonderful tool that, before I owned it, I didn't think I could ever afford to have an upres of my film that would be acceptable...so now the green pasture is in sight and I'd appreciate any last suggestions on this last question as to the best workflow to get the finished picture to open 16:9 without it being anamorphic or if this is not a wise solution...if indeed there's such a thing as hd anamorphic as acceptable for broadcast which I think isn't the case (though I'm aware worse comes to worse the hd letterbox is probably ok but I still want to know how to do this).
Thank you!!!!!!!!!!  Apple boards has helped me through the technical crazies and appreciate all input I get which has helped me learn and do things I never thought I could do or that others have said I can't do that I've accomplished with this simple footage...in any case HELP once I get through all of this I'll be moving completely away from SD and will never deal with this stuff again...(except of course with my other "legacy footage" arghhhh).

Answer 1

OK I did one pass and recorded a file on the ninja that was uncompressed anamorphic wide...but apparently I guess I was doing something wrong  with my iohd before because going back...I was able to take the uncompressed 4:3 letterbox and this time the iohd indeed output the file as a zoom wide which now appears like it was a little stretched vertically but not very noticeable but then I decided maybe it would look better using the anamorphic digibeta file because of the lines being 720x486 out and indeed I was able to do this as a full 16:9 output this time with it set to down anamorphic up zoom letterbox on the iohd and it appears this did the trick as it's exact matching proportions I see on my ntsc monitor...
Anyway, am I doing this right?  It appears now I've succeeded in making a full 16:9  file as a pro res 422 hq 1080i file from a 720x486 uncompressed 10 bit anamorphic fcp file that was created from what started as a letterbox 4:3 ntsc dvcam rgb file that was dropped into an anamorphic timeline.
I'll report how it looks once it's back in fcp on my large screen tv and after I output it to the hdv recorder.