What material for Risers?

[fishmore2013]

Too late on the floor-I bought 4 sheets of 3/4" marine plywood($99 each), from all the reading on the site I thought 3 coats of resin on the bottom, then 1 layer of mat and one layer of cloth on the top, then paint with some type of antislip material mixed in. I do have a limit on how much I can spend here. I thought this was a cost effective decent floor.

Thanks for the response on the weight issue, with an older merc 115 she got up on plane with all that wet plywood and the 3 batteries all the way forward before so things can only get better