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//calculated x value of exact middle of panel after deducting left/right sub-panels slider_center = (width_mm - left_panel_width - right_panel_width)/2 + left_panel_width; slider_bottom = v_margin+12; Initial stab at a 10-step panel layout ideas left_rib_x = hole_dist_side + thickness; width_mm = hp_mm(width); // where to put reinforcing walls; i.e. The thickness of the front panel. Current design uses six IDC 2×8 connectors with 4 positions D 3 rotary switches with 3 positions D Switch, dual pole triple throw, 3 position switch, SP3T K switch single-pole double-throw spdt ON-ON horizontal MEC 5G single pole double throw, separate symbols K switch normally-open pushbutton push-button LCD D MEC 5E single pole normally-open tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss Ultra-small-sized Tactile Switch for High-Density Mounting, 3.1mm height, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf Surface Mount Tactile Switch with High Contact Reliability, Top-actuated Model, with Ground Terminal, without Boss Ultra-small-sized Tactile Switch SPST Slide 5.25mm 206mil JPin SMD 8x-dip-switch SPST Omron_A6S-810x, Slide, row spacing 7.62 mm (300 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD, JPin SMD 10x-dip-switch SPST KingTek_DSHP10TJ, Slide, row spacing 7.62 mm (300 mils), LongPads THT DIP DIL PDIP 2.54mm 7.62mm 300mil 4-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size 6.7x26.96mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 5x-dip-switch SPST KingTek_DSHP05TS, Slide, row spacing 7.62 mm (300 mils 6-lead though-hole mounted DIP package, row spacing 11.48 mm (451 mils 22-lead surface-mounted (SMD) DIP package, row spacing 9.53 mm (375 mils), Clearance8mm 10-lead surface-mounted (SMD) DIP package, row spacing 15.24 mm (600 mils 42-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), SMDSocket, LongPads 40-lead though-hole mounted DIP package, row spacing 9.53 mm (375 mils 18-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils 4-lead surface-mounted (SMD) DIP package, row spacing 5.9 mm (232 mils), body size (see.