Thanks for the welcome.
After installing 3/4" tounge and groove(painted the exsposed side), 1/2" sound board, 1/2" osb and 1/4" floor covering, it's about 6' 2 1/2".
The motors mounted mid-ship on be its left side. Presuming the crown is mechanically and structurally sound, the biggest challenge is accessory placement and storage.
Starting batteries-they swing out and there was enough space behind them to mount four six volts.
Closer on the frame I welded up for the six volts.