sump guard

[Poodle]

Tbf Piggy's car isn't particularly low. Seen that road-sign idea used by a few people, popular with the local greenlaners. For fixing points - you could make it super easy to install by having a lip to hook over the back of the first crossmember and and a captive nut welded on to each of the legs. If you want to go full undertray i've got some measurements and drawings i did a couple of years back that might help.

if you're using an ally sump the oil will most definitely run noticeably hotter, may not be so much of an issue on diesel mind.

Seriously? Why so? Aluminium is a much better conductor than steel, i'd expect oil temps to drop if anything.