Thanks, Bobcat. I ended up going with a Paper Tiger Armaments M113 kit for the lower hull. So far, this is what I have for measurements (I am working in 1/72 / 20mm scale):
The Expeditionary Tank (aka "Ridgeway" LAV-75A4 or LAV-105)...
The slope of the front hull is 7 degrees. The up-slope on the belly near the front is 31 degrees.
The actual turret height is 32 inches, or .8 meters. At 1/72 that's a half-inch, or 1.27cm.
The hull height, without turret, without bogies, is 2m. The height of the bogies is 24" (assuming an M113 drivetrain like the RDF/LT, and my readings of the tech specs supports that, all the way to 5 wheels, drive wheel and return roller), but they overlap the hull somewhat, call it 6". If we calculate, that gives us a hull height without wheels or suspension then is 2m, or .87 inches, or 2.2cm.
The length of the hull (in inches) scales down to 4.1 inches, or 10.41cm.
The width scales down to 1.5 inches, or 3.8 cm.
As I said, I purchased a Paper Tigers Armaments M113 kit. The first assembly step will be to put the lower hull together and see what modifications I might have to make to my design to mate up the upper hull of the Ridgeway with the '113's lower hull. I hope this can be done easily.
More as things develop...
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