Big Aperture Library - iMac with SSD HDD - how to?

Just ordered the new 27 inch i7 iMac with SSD plus 2TB HDD , and want to plan the move from my old MBP.
I currently have a managed Aperture Library which is about 400GBs (on an external drive).  Clearly this will not fit on a 256GB SSD, but I'd like to get some speed benefit from the SSD.
So I'm thinking I'll change to a referenced library, placing the masters on the 2TB drive and the aplibrary on the SSD.
To get there, I plan to to go through the following steps, and my questions are, do you think this is a good approach?  Is there a better way?  Can you see any risks?
Make a backup copy of the aplibrary on my old Mac to an external drive
Open it on the iMac
Relocate Masters from this aplibrary to the 2TB drive
Close down Aperture.
Copy the (now smaller) aplibrary from the external drive to the SSD
Open it there.
I tried these steps between external hard drives with a small (less than 5GB) aplibrary to test the concept and when I opened the copy of the (now smaller) aplibrary, all worked fine.  The copy of the aplibrary knew where the masters were.
Background:-
My thinking is that the performance should be quite good since the library will be quite small (I'm guessing about 30GBs) and accesses to this library will be to quite small items (average in my test is 0.2 MB per item), whereas the images are quite large (up to 25 MB per image).  Hard disks are better at moving big items and SSD benefits tend to be higher for reads and writes to small items, since there is no seek time or rotation time.  Of course the system and applications will be on the SSD as well.
PS I may even try this approach on my MBP, putting the aplibrary on the internal drive and the images still external.

Interesting!
Thanks, Ernie.
I am expecting that Aperture will launch faster since the app will be on SSD, but I also expect that due to accesses to the aplibrary, Aperture will be much faster.  For example, the aplibrary will contain the previews, thumbnails, metadata and adjustments.  I don't really expect that Aperture will transfer images being edited to SSD, rather that it would simply read them into RAM directly, bypassing the SSD.
What I definitely WILL do is to try to observe the performance differences with the library on SSD vs HDD.
I can see this turning into a science experiment for me! 
PS, I will have 12 GBs of RAM, the original 4 plus 8 more
Message was edited by: John Kitchen - added postscript

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