Yup, using Inventor 2009 pro for the mods on beta. Works very nicely on a basic nVidia 7900 GS graphics card. 2GB of RAM is fine for most things.
http://www.b-e-t-a.com/beta-2009.jpghttp://www.b-e-t-a.com/beta-2009.jpg

The Pro version of 2009 has the wiring and all the Design Accelerators built in. Great help for designing the belt drive for the sucker - driven by two Scorpion HK4025 brushless motors ~2.5 kwatts each:
http://www.b-e-t-a.com/beltcase.jpghttp://www.b-e-t-a.com/beltcase.jpg
(the Astro is to open and close the thottle slide on the intake)

I thought drawing the wiring was a bit OTT at first, but its actually very useful being able to lay things out and figure out how the wires need to be routed.