Well, mine is NOTHING like what you guys are aspiring to build (and believe me I've considered it), but in the end this simple shelf is all I needed and it gets the job done wheneither the hardtop or softtop is on or off.
Its just a 3/4" treated plywood, some sealer and a "cut to size" piece of marine grade, rubber backed carpeting. Took all of 20 minutes to make and install and it works great and suports a good amount of weight.
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