Welcome to FSM IROCBLUE
T28 and T95 are the same vehicle according to my references.
Started life as the T-28 Heavy Tank but was redesignated the T-95 Gun motor Carriage in March 1945. Total of 2 built and the only survivor is as Ron points out at the Patton Museum. If you click on my profile, you'll see me getting up close and personnal with this vehicle.
Line drawings are available from AFV News in 1/35 scale.
Here's their link
http://www.activevr.com/afv/1-35.html
Also remember with this beast that the suspension has 8 sets of HVSS suspension per side for a total of 16 sets. Whereas any Sherman that you use for a donar kit will only have 6 sets, so you will need 3 Sherman to create this suspension system (with a couple of sets left over).
Keep us posted on how you make out with this build.
Enjoy the forums !!!!
Happy Modelling and God Bless
Robert