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If you lived close I would let you use it, it takes all the guess work out of the task of figuring out wheel offset and axle width. It will show you exactly how everything will fit in your car. If you want to make one and know someone or somewhere to get the plates waterjetted I can send you the cad file for those plates that have all three bolt patterns. The holes are cut to the tap size for 1/2"-20 threads so all you have to do is run a tap through them.
Rob its a dxf file, should work with most equipment, if not let me know and I think I could convert it to something else. If you PM me your email address I will send you the file, then just dump it onto a thumb drive and take it to the shop that can cut them out.
Rob if you make one you will need to buy 1-10' piece of 1" and 1.25" heavy wall electrical conduit. Each 10' piece will come with 1 threaded coupling and the 1" piece will fit inside the 1.25" piece, I cut mine 45" long so they will extend out pretty far. If you need to be under 48" or so just cut the conduits a little shorter. I built mine because my Nova is built to SEGA (South East Gassers Association) rules which states if you don't cut out your wheel wells your tire has to come within a 1/2" of the inside of the wheel box or quarter panel and you can only run a max 10" wide wheel. I mini tubbed my car and am running 15" x 10" Halibrand Sprint wheels that have a 3-5/8" backspace, they tuck up inside real nice. I bolted the wheels with tires mounted to that pole and rolled it under the car and spread it apart till I had my 1/2" clearance and locked it down, piece of cake!!
I think most tire manufactures can give you the cross sectional width of a given tire size on a specified wheel width.
