Yeah, plain copper contact plates (or even brass) would be far better. Also I hope that ModMaker or some other company will get to make those threaded contacts for mech boro mods. So the most valuable part here is the case and the threaded part for the drip tip nut.
For 15-30$ it'd be a great deal. (just like the Octopus squonkers used to be) ;)
But still it's a bit bugging - ya know, condensation etc., bumpy shaky small countryside roads and all that... =) - that behind the tank there's the bare battery, right there, nice and direct neighbourhood there a little space for to glue some thin plate there? lol!

I'd love a white delrin mech and to make some nice doors for it, but maybe smth better will come out in the future.