I did some plotting on a skid plate today. Looks like I can make one out of a 4'x3' piece of 1/8" plate. This will protect most of the easily damaged things under my L3301. My brother is a welder and can do the welding in a neat fashion but I can tack it together.
The lowest thing under there is the 4 wheel drive lever. Can mount easily to the FEL supports in front and the ROPS bar that drops down in the rear and unbolt the rear mounts and let the back swivel down for service under there if needed.
The plate will extend over to the right to protect the hydraulic filter area.
Probably won't protect against a land mine, but sure would keep limbs, etc from getting up into the stuff under the tractor.
I had some damage with my old tractor from an oak sapling . Don't think them sticks can't tear up some stuff !!!!$$$$$
I am now officially on the hunt for steel plate !