Vintage Simmons Drums (UK) Users Group

Work is progressing on a cart clone in various forms. I need to know
what the overall outside dimensions are of an original cartridge. My reason for this is that in the process of developing a new cart, it has come to mind that I could also design a baseboard that plugs into the SDS 6/7 cart port that allows you to fit say 4 to 8 carts and select the one to use. This would be great for existing cart owners and also allow "mass" storage until I can design a new cart that allows USB and SDCARD storage. (this unit is more work that in looks, it needs an lcd display, keypad etc and would be a stadn alone device that plugs into the cart port via a ribbon cable)

If some one can supply the cart dimensions I will know how far a distance between sockets I would need for the multi cart base board