Now here are some pictures of the process. And a big thanks to my neighbor Jeff for welding up the cuts for me!
Original transmission tunnel (with corner tabs cut):
Cuts to the driver and passenger sides:
After some "massaging" with a hammer and some heat.
Note the firewall has been folded over in these pics. It could have been cut as well:
My neighbor welding the seams for me:
All done, welded, grinded and sealed!
Now it just needs a little clean up and some paint.
One thing I would do differently is cut the support gussets on the inside of the car first.
There are 2 gussets inside the car that reinforce the transmission tunnel to the firewall and they are not easy to move. If they were cut combined with the cuts of the tunnel, it would have been much easier to widen the tunnel. Obviously they would need to be welded back into place but its just a couple of more steps. Eh, live and learn!