Remixed to allow easy location of channels, include additional volt meter, output holes and switch cutouts. I have also included some greeble panels.
Volt Meters - https://www.amazon.com/gp/product/B0761MG9NS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Contacts - https://uk.rs-online.com/web/p/battery-contacts/1725980