I wanted to share with you guys my endgame HHKB 
* Type-S Dampeners (O-rings)
* 55g Domes
* Novatouch Sliders
Still waiting to install:
* Hasu's BT Controller
* 2x 1600mah batteries
On the side:
* 3x sets of keys (Black & White Unprinted, Black Printed)
* Type-S Sliders
Current setup:
Show Image
Awesome board IonutZ! Thats one crazy hybrid HHKB you have going on there xD
Regarding your plans on adding bluetooth tho, Im wondering how you are planning on fitting two 1600mAh batteries and how you are planning on connecting two to hasu's controller?
With lithium polymer batteries afaik you could not just wire them up in parallel, nor use two (with half the voltage each) in series without using a balancer to make sure they get charged evenly.
Using two 1600mAh in series also would still result in 1600 (not 3200mAh), and using them in parallel is already not recommended for alkaline batteries and can potentially be very dangerous with lithium ones since one could charge/discharge the other to the point of damaging it or even starting a fire....
You can actually buy lithium polymer batteries configured in parallel, but these have been made from tested to be matching cells and its not recommended to DIY this and even splitting up one of those pre-made parallel ones could potentially unbalance it I think.
So I'm not saying this is impossible, but definitely make sure what you are doing as lithium polymer batteries as hasu mentioned can potentially be very dangerous.