Mxsmanic wrote:
Are there full-motions simulators for specific GA aircraft, such as
the Baron 58 that I've mentioned?

Consider making or buying your own.

Google for the keywords "full" "motion" "simulator" - you'll come up with a
bunch of relevant hits. Here's some:

Plans for allegedly building your own for under $350:
http://www.acesim.com/main.html

Another do-it-yourself set of plans:
http://www.simcraft.com/phpPages/products/primusDIY.php

Some vendors, no price info:

http://www.noonco.com/flyer/
http://www.flightmotion.com/home.htm
http://home.claranet.nl/users/wvdlel...h/index-e.html