In most electronic Devices nowadays, there are always some FPCB (FlexiPCB or Flexible PCB) being used. Although I have solved the issues of getting my designs manufactured professionally, I am always hoping to use the FPCB. A FPCB is a a flexible PCB which can bend and (almost) conform to the tight spaces of an enclosure. It is paper thin at about 0.11mm as opposed to the conventional PCB thickness of 1.6mm. These boards can withstand reflow soldering temperature too. But in terms of repairing, it might be a challenge.
So far, the only obstacle would be the cost.