This may sound a silly query but im slightly confused.
I have seen many things about RUBs.i know they are really usefull boxes......but my question is...........how do oyu actually use them to house snakes and how would you use them with a shelving unit thing?

hi just drill holes in the side at the top and put a heatmat underneath and put some beding and stuff in and your done

if using in sa shelving unit you will need a large heat pad on either the back of the unit or the bottom - depends on how you made/use it. AS for the air holes as acesnakes11 said put holes in by either say a drill or a heat tool like a souldering iron and when it gets hot push it into the plastic to make perfect size holes . Souldering irons can be bought cheap for under £5 in the likes of Wilkinsons - along with your boxes. AS long as the box is big enough to house what ever you plan on houseing in it and has LOCKABLE lid then your fine

What do you plan on keeping in them out of interest

Snakes.
thanks for the advice guys.

just dont forget your mat stat