This depends on the metal that you'll use, Aluminuim wouldn't work good. Use ';Steel';.
This depends on the yield strenght of the Steel that you'll use. Stronger steel will allow you to use less thick plate and vice versa.
Give me the stress that you'll use and i'd find the thickness for you.How thick should a sheet of metal 32 in by 60 in be to hold 700 lbs?
This question assumes the metal sheet would take all of the load. It would not if it is designed correctly. I would put tapered supports on each side and possibly one in the middle (depending on if the 32'; is the width or the length). If 60'; is the width, you might not need a center member. Side supports would lessen the thickness requirement of the sheet stock. Steel would be stronger than aluminum but also weigh much more. I'd get someone to design it for you to take all these factors into consideration.
Well there is more to a ramp than being able to support the weight. It has to be structural and attached to the object. I would request a proper quote from a contractor who's experienced in handicapped construction.
BTW 32 inches wide is not very wide, this shold be more like 60, or is the 60 the width and 32 the length? I'd think anything thicker than 20mm should be ok since it's a pretty small size but what supporting it is more important. Remember you have to measure force not weight.
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