If you go to the RealFlight - Designer's Corner part of this forum, you'll see a choice of the sub-forums for each version of RF. The thread you're posting in, as you can see just below the forum header at the top of your page, is in the RF G3 sub-forum.
If you want the best chance of having...
Bear in mind, you're looking in the RealFlight G3 forum...You'll want to check the RF7 and 7.5 forums for more applicable info.
There is a Parkzone T-28 that is G3.5 compatible here and a 4.5 version here.
Always search the Swap Pages first ;)
You're going to need more than one obscure picture (not showing much of the plane) to get someone to make a model for you.
That said, try this existing one .
Oh man! That'd be so awesome! I'll take some more pics, but here are a few I took of my plane. Please let me know what I can do to help make this happen :D
That'd be great :)