ha, and quigs I've found another example of one of those projects that only get so far then get pushed to the side in that old thread I just posted, the begginings of one design of my ultimate mini bottom feeder

...I do still have this thing sitting in a project box somewhere
I read through the thread you linked and I think it's fair to say you and I, while both enthusiasts of the hobby, approach it from completely different angles. I have to say I sometimes struggle with my chosen approach
...I surround myself with cutting edge tech, I have for years, but for whatever reason, I gravitate to an almost "old world" tech when it comes to mod building....there's just something about the Thomas Edison/steam-punk era clockwork, cog and lever tech that can be incorporated into these devices that grabs me...I think it goes back to my childhood love of Meccano
According to the Hammond site their translucent boxes are polycarb...I don't have any juices that react so using the back of the batt mod shouldn't be an issue but in looking over your concept drawing of your box with the pump piston and return juice channel and so on...as much as it intrigues me and my own gears start to turn I took a vape off my new woody...my new woody is running .3 worth of #26 duals, shoe horned into a Atomic...not a lot of space for my fave 3mm silica so I run doubled up 2mm RxW where the ends just lick the deck, I run this hypno based juice with a high VG ratio (otherwise it's too acidy) in this mod...and at .3 on RxW, (which isn't the best at retaining a lot of juice reserve) I squonk till it bleeds and just power through the saturation...I then I thought, man, everyone of my mods is unique that way...there is no way I could build some feed system that could possibly accommodate all those variables...I simply require (and prefer) the actual tactile feedback of physically applying pressure to a flexible container...the length of time I hold a squonk, the juice/wick/RDA design variables, the temp., do I want a saturated wick to power through at .25 ohms for a vape I could chew or do I want something subtle coiled at .6 where it only gets good after I've cooked off an accidental over squonk?...this list of variables is almost endless.
I get what you're saying Turbo, to build the ultimate bf, power regulated with an metered pump mechanism for the juice is an ambitious venture and a fun puzzle for the gray matter, but for me, it takes too much of the hands-on "organic" nature of vaping out of my control...don't get me wrong, our diverse approaches to what is essentially the same ends is great...there is a lot of cross-over tech that I'll be taking from you (in fact I already have)...but for my tastes (at least atm)...a lightweight, dual 18650 mech with a lot of juice capacity (plus a break from the same'o, same'o in design) is my driver.