I did it, it is great and a cheap build,

I bought a boat battery box, a jumper cable
removed the clamps and welded the worked very good
main battery is in engine bay, the other is beside the driver seat

I have pictures if you like


58 (283) Corvette top flight
67 (427) Corvette top flight
69 (302) Camaro
70 (440) Chevy
36 Dodge Brothers Hot Rod
30 Ford Hot Rod
07 Dodge Ram STR
93 Montero