Alison sent in a good question: "Not sure if you can help me out on this or not, but my husband and I are doing a mounted credenza similar to the one in Andreas' Greektown Loft. What I'm trying to figure out is if he put anything on top to cover the screws and make it a continuous surface (we're mounting three cabinets side by side).
I can't tell from the pictures, but to me it looks like it's a solid surface on top.
Alison, were not sure of all of the details of Andreas' DIY wall storage, other than the fact that he definitely used IKEA cabinetry for this piece. Perhaps one of the kitchen planners at IKEA could advise you on the what you could use to achieve a relatively solid surface on an installation like this.
Anyone with IKEA cabinet experience, please let Alison know if you think a solid surface is possible on a similar installation in the comments below.
Photo: Andreas Larsson