Having mentioned the quality of parts there are many brands of aftermarket panels for F trucks, and some are better than others.
I dont know what LMC carries but I had nearly $1500 worth of parts in my cart on sunday before my hand started to shake and I deleted them.
I actually picked up a good 2nd hand cab from here and then had the rhd conversion done, which is very easy except for the windcreen wipers. (mine are still lhd) lol.
Check out the USAtoAUS website.
They will collect and ship parts to here with all the relevent paprwork and it doesnt really cost that much, although I could imagine you'd have to wait until they had a container full before they'd ship..
When on LMC next check out the custom rolled grilles for the '79.
Very nice indeed, and I will be getting one.