As stated on the mod readme, we started using the external 3d model and the cockpit structure from Tim Conrad's FSX. The instruments, panels, UFCP and HUD are from our own. Soon we will release a new external and cockpit 3d model. More realistic and to scale than the one that we are using right now.
Although i personally don't know mr Conrad, a colleague asked permission to make a non paid DCS module using his 3d model. But the project only kicked off recently when i started coding. Then I asked some colleagues to start a new 3d model, with higher fidelity to encompass our proposal for a non paid full fidelity A-29B.
I can't help them much on the 3d model, but leaning the basics of modeling and texturing is being very fun.
This for example was my first attempt to texture the stick made by Gabriel Milaré.