I chose to go with 2 type 25 batteries....stock size for the 96 R50.   Battery from Costco: ~$90 Metal: $20. 1" x 1/16" angle and 1" x 1/16" flat stock. $20...was way too much, but I have other projects planned. (gas can mount, for example)   Need: Welder, chop saw/cutting implement, drill, cutoff wheel, hammer, phillips and flat screwdrivers, other various tools and accessories.   My measurements for each batter were (roughly) 8.75" x 7". These may change per what you use and how