@o_lampe I like opensource, because it brings so many questions which finally moves things forward.
Everyone likes opportunity...
Believe or not, people in a lab I work can populate similar things without reflow or paste mask. Yes one board takes one day... but the costs can worth for me and others.
Regarding BOM, one piece is not 100% efficient, but there is a lot of space in the original's cost for such inefficiency. Two boards are a lot better and three are 90% efficiency of 10.
I am unsure if it is fair to share my BOM here. This is opensource project (thank you!) but I have respect for authors and they need our support not concurrence. So no clones, no parallel kickstart actions... BOM costs and manufacturing costs are questionable.
I will have BOM costs done in a month or two (I have other priorities). Then I can share some numbers.
Now I hope others could share my passion.