Ultimaker Original Plus+ with Dual Extrusion

[Arie_Dub 0]

I am making my Ulimaker original plus dual extrusion and I was told that I can't have the second hot end and the heated bed on at the same time or it will draw more power than is supplied. So, is this the case? I also plan to add a second fan mod. I have a second main board as X-Axis on it doesn't work. If I get another power supply could I modify the firmware so that the 2 boards work in tandem. If I can connect the main boards in tandem and mod the firmware then I could make it Quad Extrusion and could use 1 of the axis' stepper motors to control raising and lowering the active/inactive hot end as needed!

Thx Arie