Oz, FlexSeal does contain 'aliphatic petroleum solvent' & 'liquified petroleum gas'...so save it for your roof or 'cutting/repairing boats' ( right, sure...)....;)
Black Hole does sound like a win...I'd coat the interior with a white latex first, for the seal & dust issue and it'll ensure the BH will stick 'n stay...
Your calcs are correct...*G* I had a thought as to how you might 'dial' the cabs in for your SSRs', since the difference between 173 & 519 cu.in. is rather large. It would entail a bit of swapping the face panel on & off, but the cab does have the hardware that would make it less painless...
A typical 4x4 from Home Despot...nominal 3 5/8" sq. = 13.14 sq.in.
173 / 13.14 = 13 1/8" for .65 cu.ft.
519 / 13.14 = 39 1/2" for .45 cu.ft.
One 4x4 @ 8' ought to be enough for both.
Divide those lengths to fit within, add/subtract until you like what you hear. Duplicate for cab #2. Glue down, paint, apply BH, final assembly.
Crack a cold one and enjoy the fruit of labor, etc.
Ought to beat mucking about with foam...'interior aesthetics' are up to you. ;) That interior bracing panel shown in the PE pics makes doing something on the back panel to break standing waves front/rear (one of my pet peeves..) difficult to address....but some of my projects go off the deep end with such...
Good luck...*S*
Black Hole does sound like a win...I'd coat the interior with a white latex first, for the seal & dust issue and it'll ensure the BH will stick 'n stay...
Your calcs are correct...*G* I had a thought as to how you might 'dial' the cabs in for your SSRs', since the difference between 173 & 519 cu.in. is rather large. It would entail a bit of swapping the face panel on & off, but the cab does have the hardware that would make it less painless...
A typical 4x4 from Home Despot...nominal 3 5/8" sq. = 13.14 sq.in.
173 / 13.14 = 13 1/8" for .65 cu.ft.
519 / 13.14 = 39 1/2" for .45 cu.ft.
One 4x4 @ 8' ought to be enough for both.
Divide those lengths to fit within, add/subtract until you like what you hear. Duplicate for cab #2. Glue down, paint, apply BH, final assembly.
Crack a cold one and enjoy the fruit of labor, etc.
Ought to beat mucking about with foam...'interior aesthetics' are up to you. ;) That interior bracing panel shown in the PE pics makes doing something on the back panel to break standing waves front/rear (one of my pet peeves..) difficult to address....but some of my projects go off the deep end with such...
Good luck...*S*