I ended up making my own heatsink also as the shipping costs were crazy. I used a 1/4" aluminum plate and the fins are 1/8" aluminum angle. I just used some heatsink compound between the 2 pieces and riveted the angle to the plate. Made it nice as all the leds are on the plate and can go exactly where I want them. I then have 2 12v computer fans on top of each module. Havent had any problems yet.
With channel you can probably just mount the stars to the bottom face and then connect all the channel together on the ends. You just need to make sure you have plenty of heat dissipation for the heat. Mine starts to warm up slightly when I turn the fans off. Going to put a high temperature cutout on it soon..
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