Had a bit of a late night as I worked on the T3 a bit to see what it does.
I've decreased the detail and think it looks still ok, the front doors aren't 100 as desired, but I did get the mesh detail down to leave some space for additions, taxi sign, flash lights, roof-rack ...
On the materials I will need to fully create them from scratch, the images are with all plain/basic materials that aren't mapped for the model.
Still is there really not any T3 transporter out? Before I put this on my project-board to-do list?