Shimming if often used in PL lenses that have a scale for focusing. This scale is calibrated with a target like a Siemens Star or a Test Sheet.
Companies like P+S Technik do this with a rig where you mount the lenses and you can measure the focusing distance from the sensor to the target.
Once this scale is engraved cannot be changed as far as i now and that's why people shim the mounts.
Other cameras have "back focusing" that moves the sensor back and forth.
Photography lenses don't have this scales so they don't need shimming unless you want to change the range of focus to allow the lens focus more at macro or at infinity.
I think it's the correct solution to have the possibility to shim the mount, because otherwise you may need to move the sensor or try other more complicated ways to move and align the lens.

It looks really cool!

This is the first sketch of the pcb that i made. it's 18x72mm, to fit atop of 4 18650 cells.

Great finds!

In T736#12437, @RexOr wrote:

"Open source battery - Doesn' t exist yet but if we ever do create one this chip might come in handy: http://www.ti.com/product/bq34z100 "

spring loaded individual 18650 cells. would that be an option to avoid DIY and legal issues? is it secure enough without soldering?

is it possible to cover a smaller battery (8 cells) and big (16cells) with the same electronic design?

Yes and no. The way i throught the design was in modules of 4 cells.
Using 4 cells with a single pcb on top, forming a unit of battery.
This unit can be stacked to form the size of battery you want, in 4, 8, 12, 16 cells and so.

:O it's not open source!

I finally made the Eagle work on my computer, i have to say, is almost unusable compared to older version of Eagle.

Here's the charger. It's basic but it should work more than fine with protected batteries.

It looks awesome! i like that you leave the connections on the sides.

I research the ATmega8HVA and is seem to be "self programming" meaning that a test bench is needed to charaterize each type of cell and program the IC.

In T736#12254, @sebastian wrote:

One question though is if voltage measurement alone is enough to evaluate battery capacity/health.
I know laptop batteries for example monitor all currents going in and out over the entire battery lifetime and account for any aging phenomenons of the cells.

Laptop batteries don't actually do that, they have something that is almost planned obsolecence. For example, Dell uses a microcontroller that counts cycles anr/or usage hours, but not for each charger, they count the entire life of the cells as a whole (all of them in the pack). When a certain prefix limit is reach, the micro tells the computer, and the computer refuses to charger the battery.
So is a "safe life" protection. The battery may be fine, but because they want to avoid a lawsuit if something happens they just block the battery after a a few cycles/hours.

Well, you can make a led status without a PIC or any microcontroller. we could desing a status around a vumeter IC, like the LM3915., with the press of a button it will tell you the state of charge.
The advantage of an analog state will be 0 current drain. Because you only read the battery when you press the button.

I Sacrifice my very own japanese sony charger from 1997. Is still working properly so i think is a design to look for.

I corrected the schematic of the Battery Protection, i should be like this. Also aldd a 3 pin connector to allow the use of a charger/balancer

What would be better:
A- A CHarger with the balancer incorpored and a battery with only low voltage protection
B- A more simple charger and batteries with their own low voltage protection and balancer.

Yes, it won't be very hard to design our own battery pack for the Axiom.
Here i made a Low Voltage protection. It will cut at 6V, (3V per cell) and it can be added to each Sony NP-F in case it's necesary.

Sony's NP-F batteries do have their own protection inside the battery. I disassemble one to check. This one in particular has two 18650 from panasonic, and it was built in 1997. This batteries are still being produced 20 years later and used in modern cameras like the FS700. So i think is a good route to build the battery system.
The camera could have a universal power conector to change between different battery plates, so other baterries could be adapted as well. Like RED does with their cameras.
Even an ATX power supply connector could do the job.