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So traditional build how do I close the cavity at bottom of windows and build up the cill level? How high does it normally come up, bottom of window and then window board? Not the best images in the world but will give you an idea of what I am talking about.

Today was one of those 'b*gger b*gger b*gger' days. Offered up the various bits of wood, sill, etc, to the window to work out how I was going to do the reveal detailing, and it turns out my sills are not deep enough. Nobody's fault but mine- at some point in the build I had switched from using 25mm cladding battens to 50mm, and this has eaten up the overhang. If I press ahead, the sills will just, barely, clear the edge of the cladding, with around 10mm overhang. I think I have three options: 1- Buy new, deeper, sills- obviously the most expensive option. They are Aluron profiles, roughly how much would these be per metre? 2- Re-install the windows (must be a computer joke in there somewhere). I am quite reluctant to do that knowing how long it took me to put them first time around. I could probably do the job in two or three days but it's a psychology thing- would feel like I was taking backwards steps. Moving them 25mm towards the outside of the wall would be enough to restore the overhang and would make the faces match the counterbattens, which could simplify some of the detailing. 3- Alter my cladding design. I have vertical board-on-board 20mm larch planks, nailed to horizontal 50x50 battens which in turn are screwed to vertical 25x50 counter battens. If I change the horizontal battens to 25x50 that solves the problem (it was the original design) but will it make the cladding too prone to flexing? I don't really want the wall to bend when you lean on it! How much would it help if I doubled the number of battens (easy) or halved the centres by installing more counterbattens (less easy, and these would not be nailed onto studs, just the 11mm sheathing). Any other options? I'll just have to console myself that this is probably the silliest mistake I have made so far, which is not bad going given I have designed, drawn, and built this house completely singlehanded so far...