ks fantastic! You should sell them!
Thanks Dave - actually you can buy these (more professionally made than mine!) but you're talking about £140. Bike Station do something similar for £40, but with the stem welded onto a supporting frame, so cosmetically it looks rather industrial. Also uses Aheadset parts which I think lack the elegance of the forged quill stem.
It's a plaster-on-brick wall, which I drilled well into the brickwork and have used extra long screws to go through the stem, the wood and into the wall.
I thought about bolting the stem directly to the wood, but that was too shoogly. I thought about screwing the stem directly into the wall, but then it would place the bike too close to the wall and also risk crushing the plaster. The wood works well as a base as the metal can crush slightly as it tightens and spreads the load across the wall.
The rawlplugs are rated for 30kg into brick and plaster, and the bike weighs ~9kg so I'm fairly confident it will hold up!