Took some time, today, between errands and moving snow, to finish the cuts of all the panels except the interior braces. Looking at this stack of goods and imagining the final aspect of the boxes, if this speaker thing doesn't work out, I might drill some holes and ship myself South.

I will do some light trimming on the table saw and then proceed to vent and driver cutout. The original description of this MLTL design was to use a vent the same size as the original Model 19 and that would be positioned close to the bottom of the cab on the front baffle and centered, I would presume. I have the woofer cutout marked at 3" below the top edge. That will allow me to get a bolt into the frame of the woofer underneath the doubled top panels without too much trouble. I have established the diameter as 14 1/8" as per Altec's spec sheet.

One thing that is nagging at me is what I'm going to do for access to the interior and to provide for future vent modification. The latter isn't that critical as I am thinking of more than a few workarounds should that be necessary. I know GM advocated cutting the front baffle and that would certainly allow provision for access and vent mods but I am very reluctant to do that, mostly for cosmetic reasons. Would it be possible to use the bottom as an access port if I went to somewhat extraordinary measures to insure there is a tight seal at that point? I'm thinking of a neoprene or butyl high tech gasket material and through bolt the bottom panel into cleats or window pane of one the doubled bottom panels to accept the exterior bottom panel. Would I be better off, functionally, by using a purpose built access port in the back panel?