Multiple IPv6 to connect to single IPv4 server NAT-PT

Hi Expert,
I've a requirement to implement NAT-PT for 3 IPv6 customer they will be connecting to our one server IP within IPv4 network. I have no chose to choose
NAT64 instead of NAT-PT as we know NAT-PT is historic per RFC4966. So. I checked the link below with V4/v6 topology with multiple mNAT-PT devices
http://tools.ietf.org/html/draft-park-scalable-multi-natpt-00#section-5 as an option. However for my design is not, we are looking to do the NAT-PT in our router that connected those IPv6 sites into one IPv4 server. I tried to lab this up and I had issue with Ipv6 nat prefix /96 as each customer will be assigned diffrent /96 prefix and I can assign them on the interface Egres to the customer , however there will be issue assigning those prefix /96 to the insite fa0/0 which connet to the IPv4 server. So I'm looking to see if some one have any other option or if some one know good link to the NAT-PT using PAT I belive could solve this issue.
R1(IPv6) & R2(IPv6) & R3(IPv6) connect to R4(IPv6+IPv4) where the server is behind R4.
Any help will be appricated.
Thanks

Weak up guys, no replies yet. Anyhow I got it to work with NAT-PT using PAT. I assigned multiple 2001 & 2003 v6 addresses in 2 diffrent routers ( 2001:A:B:F::1 & 2003:DB8:BBBB:1::9) accordingly and on the NAT-PT router configured the following:
router 3:
ipv6 nat translation timeout never
ipv6 nat v4v6 source 192.168.40.200 2001::C0A8:28C8
ipv6 nat v6v4 source list list_to-ipv4 interface FastEthernet0/0 overload
ipv6 nat prefix 2001::/96
ipv6 access-list list_to-ipv4
permit ipv6 2001:A:B:C::/64 any
permit ipv6 2001:A:B:D::/64 any
permit ipv6 2001:A:B:F::/64 any
permit ipv6 2001:DB8:BBBB:1::/64 any
permit ipv6 2003:DB8:BBBB:1::/64 any
Then Ipv6 nat on the interfaces and I can ping from the remote v6 network to the server IP however can not ping from IPv4 to IPv6 back, this is where I need to work on, if any one know the answer please reply I may be missing something.. Thanks
Thanks to the cciethebeginning web site.

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www.rouxacademy.com / 10.0.1.2
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