Hi,
The base kit it's Tamiya U.S. MARINE AAVP7A1 w/UGWS. I used gear conversion from Blast Models - AAV7A1 RAMS/RS RUNNING GEAR WITH NEW TRACKS. 
The next step will be scratch build with late muffler and assembly EAAK armor from Hobby Fan.
And some picture from work:
All comments welcome.
Best regards
Tomek