Welcome to BVEStation.
Once i have a chance to ride the Staten Island Railway again, hopefully we can modify the model for the R46 to create the R44. Should be fairly easy to modify from the original sketchup file. It would be complicated to modify the B3D files due to the nature of how the blender plugin triangulates the faces.As for the SIR version, nyctrman and I are taking care of that, so that DJ Hammers can focus on the NYCT R44.
I am not sure if you need it or not, but I can get some SIRT R44 blue seat textures, to save you a bit of trouble. I have not really gotten a chance to contribute to anything yet, I would love to have a shot at the R44.
Do we have sounds for the R44 yet? it should sound like the R68 a little bit if im not mistaken.
If You need anything, im on fort washington by the 168St station