Small update here. I've been working on the routing part. it's been years since i played with the nets, and wires on Eagles ... Oh boy, its a mess ! and while placing, moving components, i was thinking , wow, the Balun filter, the NRF24L01 are going to be impossible to hand solder correctly ! and I don't really want to buy a microscope, a $300 soldering station, ... So I looked around and found something interesting so I post it here, if some makers don't know about it, and are afraid of SMD soldering : OSH also make stencil for you, Kapton stencil for $5 ! then it's a peace of cake or is it ? Has anyone tried it before ? I'll definitely try it