[LMH]

I'm not a Kirkham owner but someday I will be!
Anyway, I've done this already in dreamland. You need to decide on what finish the body will have and figure that into your order. If your going to paint it, then filed is ok but if you want brushed or polished, ad that now. Also have the cut outs done for the sidepipes.
I would ad wheel-well protection, the headers/sidepipes and the Kirkham differential set up. It's very nice!
I would upgrade the brakes but that's just me. I would also opt for wool carpet and install it myself but nylon looks nice too. ( I like wool!)
Anyway, that's how I would order it.
HTH,
Larry