Wayne Parham Messages: 18835 Registered: January 2001
Illuminati (33rd Degree)
I like using black number 6 pan head screws. Every hardware store in town will have them, but usually not in black. If you can't find them in black, get the standard ones and paint the heads black after installation. That's how I always used to do it before I started buying the ones that already have a black finish.
About the cabinets and crossovers, I usually wire-tie the coil and cap to the cross-brace. If the cabinet panels are cut on a table saw with true edges and assembled with clamps, then you won't have any leaks, and no need to caulk the edges. But if you're unsure that your cabinet is airtight, it won't hurt to add a bead of silicon along the inside edges.