Finally some progress. I made the tranny cover/tunnel from a single
piece of 18ga steel, using a band saw and a bender (at work

)
I think it came out pretty nice. I then fit the tunnel with the floors,
and made some L brackets to join them at the seams. I hindsight,
I should have bent seams on the tunnel to begin with, but it all should
weld up nice and strong. I am going to add a small lip where the tunnel
meets the firewall for added strength, and will add a couple of bent
tube braces to the inside of the tunnel for rigidity, and to prevent any
vibration or oscillations while driving. I then carefully measured the
distance to the S2000 shifter, and cut a hole for it. I ordered the
stock S2000 shift boots and brackets to make it all nice and weather
proof, and quiet (see the S2000 parts diagram below). Will now begin
tacking it all in, and it's off to the dipper!!