7xbus - 2mm/2mm pitch connectors, 2x15=30pin for volume orders (molex board socket found only as 32pin)
7xbus - 30 or 60 or 90 pin card to backplane or board to board connections
7xbus - 3V3, single sided SMT, hotplate/preheater + hotair (THT connectors mounted manually as last step)
7xbus - possible DFM pcb-fab mounted SMT modules in volume? (THT connectors mounted manually as last step)
7xbus - primarily CPU+MEM module integrated, maybe even with few backplane slots, so NO board-board needed


MOLEX / Connector                        DIGIKEY 1/100 (#)    MOUSER 1/100 (#)     LCSC PART 1/30 (#)
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78787-3054 backplane socket straight     $1.55/$1.09 (2332)   $1.54/$1.08 (2678)   C2906083 $0.34/$0.26 (2402)
87264-3252 board-board socket(32) right  $4.82/$3.38 (1048)   $4.33/$3.05 (2671)   C2833919 $0.78/$0.59 (776)
87760-3016 card/board header right       $2.68/$1.89 (9567)   $2.63/$1.70 (2272)   C2906021 $0.31/$0.25 (2405)
87833-3020 card header shrouded right    $3.90/$2.73 (3658)   $3.83/$2.69 (1406)