Sino Sigma did asdvise me not to open the cubes, as they had customers previously who had shorted the units by fiddling about with the blades.
Ive had all my Cubes open and stripped out totally with no issues. YMMV.
It's important to understand that the combined weight of the blades is pretty hefty so when sliding out the main board, carefully support everything as best as possible. Otherwise the main board could bow slightly or the blades could "lean" outside perpendicular and cause damage.
But if you're careful and not klutzy you should be just fine.