Hello !!!! I am trying to DIY a printer thats based off the 3dp Unlimited Bench style printer. I have procured 5 x 1500mm (5ft) lead screw linear actuators. If you can provide some suggestions for me I will be super grateful!!

Motor: Came with nema 23's should I upgrade them to a larger one?
Structure: the lead screw rails seem a bit flimsy so I was thinking to reinforce with aluminum plates and brackets.
Motherboard: Here comes the tech question, which motherboard would support this build area? Arduino?
Extruder: so I am quite sure I need dual extruders, not going for super fine quality prints because we are aiming for size , which one would you recommend?
Heat Bed: So I was thining of using a tempered glass table at the base and diy the heat source, any recommendations there?
Any software suggestions would be greatly appreciated also!

So I guess everyone is gonna question why I need to build such a big printer, we are trying to build custom designed injection moulds for auto industry, hence the size. Any input would be greatly appreciated!

Sincerely,

Ken