I have successfully used the XIAO nRF52840 & Wio-SX1262 Kit in a DIY Harbor Breeze repeater. This permits me to build a Meshcore repeater at a parts cost of around $32. You can read about it here.
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Hi there,
And Very Nice work, Well almost
You may get honorable mention on the solder work.. 
GL 
PJ 
it is very cool though… 
Yup such soldering needs a special badge … 
Btw you should try wiring harness connectors here, something like that: Wiring Harness Connector Types: Sealed, Selection & Repair - Unikeyic
Such a display ruins the show ….
flux is the key! its like lube for the solder