I left that panel in my IRS locost uncovered. I think Ron's "book" live axel had no cover. You may want to be able to wrap the rear skin at least 120 degrees around the lower round tube and rivet vertically from below. This will prevent you from attaching the under panel unless you wrap one over the other. If you decide to go ahead and cover it, consider the road cr*p that will sit in there at the forward square tube and have no way to exit. Not having the rear panel allowed me to add my custom luggage rack receivers.
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Chuck.
“Any suspension will work if you don’t let it.” - Colin Chapman
Visit my ongoing MGB Rustoration log:
over HEREOr my Wankel powered Locost log :
over HEREAnd don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766