DIY LED Light Questions

[Beanz]

Naw i'm using the the fixture to hold down some acrylic sheets that i already have on top of the tank (should i cut some spaces in the acrylic and buy some fans to mount is in it to get more airflow over the top of the tank water? or will a 10 gallon sump with a coralife ss 65 gallon and 10 gallon refugium b enough for gas exchange and such?), ill probably raise the fixture up maybe 4-6 inches and hold the acrylic down and keep the fixture propped up on some 1X1 struts. I think for the fixture imma use L channel aluminum and put the heat sinks in the L, then i was thinking of screwing the L channel onto a 2X4 than putting the same stuff that's on my stand. But before i will cut squares in the side of the wood so i can mount the fans in there. Is this wise to mount the aluminum to the wood? or will it get too hot?

Thanks, Ian