I had no real idea what I was going to do to mount the clocks other than a few little bits of info here and there in threads. Obviously step 1 is completely strip the front end down to the forks and headstock / ignition. Then you can think about your clock bracket and see what needs doing better. I bought a sheet of aluminium that was about 30x50cm or something and quite thin I would guess 2-3mm and that was £5. Myself and my Dad then went about making templates from cardboard, it was a lot of trail and error, then went for a first prototype in the aluminium when we were happy. The plate is big enough for 2 attempts so your first one doesn't have to be exact first time. It can all be done with a hacksaw, a file, a drill, a hammer and some patience. For the bend so that the clocks are visible when you're in your normal riding position, you need to carefully hammer away at the underside of the aluminium and it's once again trial and error and taking your time. I will try and get a photo of what I made this weekend and the shape of it if you would like, it's crude but it works. It's also worth buying some rubber trim to neaten up all the edges and make any sharp areas safe.
As for actually mounting it, I drilled and tapped a hole into the underside of the top yoke and used a hole that was already there for the throttle cable guide or something then bolted it on from there. We then drilled two holes in each corner for the clocks to mount into, I sawed off the third clock bolt at the top of the clocks and painted the rear of the clocks black to try and tidy it up a bit. It's all a bit tight with the ignition like I say as the whole thing is bulky, leaving a bit too much of a gap between headlight and underside of clocks which you don't see on purpose built nakeds. I will be trying to sort this out though. If you want I can try and find the links for the ebay items I purchased tomorrow, things like the headlight brackets, rubber mounts for them to fit our forks and the headlight itself which is actually far better than the OEM boxeye headlight. I would say though if you plan on doing this it pays to get some better looking handlebars as the OEM ones look terrible naked.