Tell us about yourself!
Did I miss something? I can't find a parts list for the micro usb nor the led strips.
I hope that you held the minimum required clearance between your thermal reflective barrier and any other surfaces. You need a 1/4 to 1/2 inch air gap minimum for reflective barriers. With several layers of reflective barrier one does not need mass insulation, this reduces the heat up time of the sauna.The cost of say 4 layers of thermal barrier is the same as one of mass insulation!I Hope this helps.
One can also use old weathered grained wood or other materials to give texture to the finish...or even place fresh leaves from trees on the "bottom" before the pour.After releasing the concrete these items will be exposed, when leaves dry they will wipe away.... the negative, anything that is not sooth will hold water spills etc.You can possibly rent a diamond hone..a large circular weight with an offset handle and diamond grit on the bottom. You "spin" this on the surface and it will hone it, cutting through glass and stone and rocks, virtually anything that is used as aggregate. These surfaces will be smooth and polished when finished.