having a foot of speakers in a 3 - 4 foot dash it should be easy to hear whatever is playing on the radio !!!Today's effort was for the dash panel, an important part of the structure, and I did 2 of the 3 main chassis crossmembers as well. All parts in red in the CAD picture.
Couple of smaller braces also, and the 2 big holes are for 6" radio/music speakers.