only advice I have is:

1} use a pc of plywood etc.....roughly cut to the pan size.
2} on top of said wide board take an old towel or a couple shop rags and fold them several times over,so they fit ontop of the board.....this will help the wood conform to the oilpan better.........it'll help keep the pan from denting in.
padding only needs to be 1/4" thick or so.
You don't want your pan to cave in and block the oil pickup screen/inlet.

Bansil

Also watch the firewall/engine "parts" clearance....like the heater hoses.......I'd keep the tranny mount attached....maybe loosen the bolts a couple turns so you don't jack up the engine to much and bind the tranny mount.