Just to keep an update to anyone interested.
The right pump finally arrived and i was able to plumb all the lines.
I have added a fuel pressure sensor (0-5V) which will be routed to an analog input of the CM5-LTS add-on board (no more analog input in the main controller, i have to buy the extension board for that)
This way I can read and compensate the meth line pressure while varying the duty-cycle of the injectors or while the boost pressure increase.
This way I can always have 100% control of the pressure for the injectors.
Tank with fittings
What you can see in the battery compartment (pressure sensor to be connected soon)
Also a test in open-air with 40% Inj duty-cycle and 30% pump duty-cycle.