Built this last spring:

No problems, all OOB except I added Verlinden .50cal and .30 cal MG's. I deleted the benches but left the attachment points. I added a tarp for fun and the figure is just for the photo.
I had no distinct problems with warpage or parts fit OTHER THAN the upper hull, lower hull seam along the very front...it was annoying, but was eventually defeated. :-)
THe tracks were zero problem for me, and I used two staples per joint to help keep them together...and it looks just fine, no problems at all.