looking into putting new sheetmetal on.. help

[randomhero472]

im wanting to convert my stepside to fleetside, and have been looking for a complete fleetside bed in good shape for sale and have yet to find one thats not junk, so im thinking of just putting all new stamped metal parts, here is my question:
1)what companies do you guys trust and use for body panels

2) converting from step to fleet.. exactly what peices will i need (bedsides, inner bed panels...) im just going to look online and try to get a ballpark of how much these new panels will cost me

3) also the bottoms of my door have some minor rust, if i went w/new doors what all peices will i need for that?

thanks fellas