The Thon Studio Desktop Rack does as promised. You get 4U of space (leaving me with "headroom" of about 5mm, which might be too few for a heat-inducing-poweramp) within 4 veneered pieces of (ply-?)wood, with a thickness of about 1,6cm each.
The height is well suited for placing a monitor on top, while you're using a laptop. On the other hand - unless you get a second unit, you have scarce room, so be aware of that, when you use it as starting equipment for your home studio.
The veneer is done better than on IKEA-furniture, where you can expect damaged/chipped/unclean edges.
On another note - my rack is housing a Line 6 preamp/modelling-unit and a rack-drawer. Do not forget the dimensions! The rack drawer protrudes the rack by about 15cm.