Hehehe, the most reliable guy would be you, LOL.
Serious, it's not forbidden to request an aircraft,
but those few who actually deal with the design software are usually full involved with their own projects.
Mind you, making accurate aircraft is a long and tedious task.
Think in month and years rather than days or weeks if you're limited to freetime designing.
Just for the case you're interested in designing your own bird,
get the required software here:

Gmax, the 3d proggy, free download
http://www.discreet.com/products/gmax/

CFS3 aircraft & vehicle SDK, required to export to m3d format and to figure out the general requirements.
http://microsoftgamesinsider.com/CFSInsider/default.htm?nc=1

The above is for creating the 3d model.
You'll also need a paint program like Adope Photoshop or Paintshop Pro. These are either pay- or shareware.
Next you'll need tools to create the flight dynamics.
Stuff here http://www.avhistory.org/