Sure, I'm basing it on the EiG cells that FVT uses: each cell is 3/8" thick x 10" x 5 1/2". There is 24 lineal feet of these cells in CarBEN's floor battery bay: two long rows 7'-8" long and two short rows 4'-4" long. The spaces for the wiring (and they use small gauge wires -- see these pictures:
FVT eVaro :: FVT eVaro battery pack picture by NeilBlanchard - Photobucket are 2" in the center (where the terminals on the long rows are) and 1 1/2" where the terminals of each short row is.
I've got new 2D drawings underway, so the dimensions of the up to date CarBEN EV Mk 3.8 will be available.