Here are some answers.
1. did the M1114 have a wench under the rear bumper as well as the front bummper?
No, there is no winch under the rear bumper.
2. What is the interior color?
Usually the same as the exterior, sand, or medium green on camo vehicles.
3.Are the M1114's primed before they are paninted the sand color? What color is the primer?, I would like this info for simulating paint chips and such.
Yes, the primer is either red oxide or flat black, depending on where they are manufactured.
4. About the gun mount on top, I have found that not all M1114's have armor plating on front, back and sides, all have atleast the front, but not sides and backs, does this have to do w/ production runs? earlier models dont have a full armored gun mount, later ones do?
More a necessity due to the type of threats faced. Early on, they were deployed w/out the armored gun station. As the conflict progressed, more protection was added.
For a really nice conversion, MIG has an M1114 set that includes the armor for the gunner's hatch and a variety of weapons etc. It is a really good kit and can come out really nice.
Good luck.
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