i would have used a 1.5m.
The 15M would be simpler to "fit"
A lot less wiring/connectors.
As Ducvet wrote, the 5XM is more tuneable and watch for "hidden" inputs that may have been in the donor bike's dash unless you are also using the dash.
Watch out for immobilisers as well and how/where they are.
The 15M has 16 x 16 tables and the 5XM has 20 TP and 32 RPM with better granularity.
The 15M has the air pressure sensor on the PCB inside the case.
Air temp sensor is on the black bracket behind the headlight/on the triple clamps.
The A0 and A8 versions have slightly different wiring and the A0 does not have a side/kickstand switch.
An A0 can be made to run an A8 bike and vice versa.
Obviously you will need a high pressure fuel pump and associated plumbing.
Do you have links to the builds by EIGHTfortyEight and davesprinkles?
I would be interested in reading about them, the challenges and how they overcame them.
- with a WBO2 sensor and ScanST it eminently possible to log AFR and other parameters relevant to modifying maps.
That is in conjunction with Tunerpro, IAW Reader and IAW Writer.
In the absence of knowledge about those builds and ECUs used, you would need a "starting" map and XDF to suit the ECU you will use.
I have XDFs and bin files for the A0 and A8 900cc bikes.