I've got my mount welded together and mounted on the firewall.  To my
great suprise, it actually fit the first time.  I did have to cut a
section out of the oil pan, but I'm now thinking that I'll cut even more
off.  The oil pan is made or .060 steel.  Instead of sandwiching in a
1/4" aluminum plate as Tracy suggests in the conversion manual, I'm
thinking that I can weld  1/4" 4130 ears onto the oil pan, with a couple
of 'arms' extending down the sides to pick up several of the oil pan
bolts.  My first thought is that each ear would have 8 bolts, plus have
6 to 8 linear inches of weld to the oil pan.

After this, I only have one large welding job left, that being the canopy.