Hey it's a "What about this combo?" thread!!!

I'm looking for opinions because I'm at a crossroads. I have been collecting parts for my turbo build for about a year and of course keep dreaming bigger.
So far I have a Holset HX35W set at 20psi, a Mighty Demon 650 Blow thru, an intercooler from a 135i twin turbo, a 52mm BOV, hedman tight tubes, 3' x-pipe exhaust, oil lines, catch can, boost referenced fuel reg, fuel pump, swapped to manual steering for room, have all the cold side piping, using manual boost controller, just need to have the exhaust connected and flanged then take everything in for ceramic.

But I have another Holset HX35w, so Im thinking of just flanging the headers and running dual. Would this be too much? Im pretty sure I would need to put on new waste gates or actuators at least but do you think it would be hard to spool? I see people put them on 2L's and such but I don't see them twinned very often, also I'm not sure how to combine pressure maps, I know I'm good with one but will I need a bigger carb for two or will it matter if I drop the wastegate psi on both?

This is all on top of a 360, M1 intake, mild cam, 150hp No2. strip primary street secondary