Ok, so I've gotten the top pretty flat. It's not perfect, but I suspect that if I spend any longer on it, it'll get worse.
I've spent a bit of time on the underneath, just to get it roughly there. I suspect that I should spend a bit more time on making sure that it's totally flat on the underside, but as I'll probably make a mistake on getting the supports on the wall, which will render time making the bottom flat pointless. i.e. they won't be flat so I'll have to shim/adjust it anyway.
However I now have a dilemma which I knew was coming, but I'm still not sure how to fix it. Well two actually.
Number one is a question of fitting. At the moment, it's just a long rectangle, which can be easily slid into the alcove. I have also cut the piece of wood for the windowsill part of the worktop. Once that goes on I don't know how I can get it in. As the worktop is the full width of the alcove, it's not possible to put it in at an angle and then slide it across. Also once the piece for the windowsill is on you can't slide it in straight. Again due to all the bits that stick out, I can't put it in on it's side and then let it go flat. If you're still with me, then suggestions on a post card?
Number two is should I bother putting a piece of wood across the grain on the end? Sort of like you see on a lot of chopping boards etc. I've got enough wood to do it. I'm not going for any kind of look, but I'm wondering if it'll last longer that way.
Also chamfering the edges, worth doing? How much should I do it by? Any specific tool? Or just a no 4?
The epoxy has arrived, so i'm off to do that now.