How are the drivers gonna cool?
When my Labs are run hard for hours on end, the alum. access plate gets fairly warm to the touch. Maybe 20-30 degrees above room temp. My plates are 3/8" thick and really soak off the driver heat. They make a wonderful heat-sink and I think are key to getting the drivers out of thermal stress.
Matter of fact, I've only had driver failures during beta testing, but the failures were traced back to air leaks at the speaker/baffle board gaskets and insufficient torque on the access plates. I've not had thermal problems at all, just excursion/suspension tearing issues from kick drum impulses.
Now understand, I run the PISS out of these things and they're powered with 9001's.
The only thing hard to build is the module. If you seriously apply yourself they take about 5 hours each to build (4 took me 20hrs) from cutout, routing, to the assembly. I use screws to assemble them (self clamping with them)so considerable time is spent counter boring and marking out screw positions, trimming, and dry assembling. I'm anal about the module angles and want them perfect. One of my character flaws I guess. Drives my employees nuts.
I've built 8 Labs now and they each took 20 hrs. to complete, even the second four took that long. I figured with the learning curve behind me it would be a lot easier. Wrong! It's tedious work.
My approach is to cut critical panels slightly long and trim them in final assembly and dry fit stage. That is responsible for some extra time, but the scrap pile fits into a 2' x2' cardboard box per 4 subs!
Your results may vary.
I can only build about 4 a year with my schedule of shows.
Later,
Dan o;)