The tanks that I drew don't fit well with the idea of throwable capsules, I should have looked more in the ruleset :/
See attached some concepts for 4-slot and 7-slot clips. This may needs some testing for balancing, if the ammo counts need to be changed I'll have to modify the graphics accordingly.
handobjs are tricky, I'll only try when the design of the weapon itself seems "final"
I think that just the single can would be best; each canister can be said to hold enough acid for multiple shots with the advanced acid canister holding less due to the extreme strength of the acid.
I'm still playing around with the weapon a bit, including the clipsize, so I'd hate to have to ask you for a redesign every time I started making adjustments. With a single can, it can just be assumed that the gun doesn't have to empty out the whole capsule to produce an acid shot.