Don't mean to double post but figured some pictures of it now I've started would be appreciated. Turns out the wrist face of the fore-end was way worse than I first thought and will need more work than anything.
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The LHS wall at the rear of the fore-end is slightly split from the back towards the front, but not far. I reckon its probably too fragile to open up, so I just put two holes down from the top and glued and plugged it in. Then relieved the split under the fore-end and plugged it too. While I was trying to open the crack I found a few new ones and realised the split did in fact run through the top into the barrel channel where before it looked clear. Also the RHS of the rear of the fore-end is pretty much coming apart, but I'll see what I can do. Because of that and the fact I will be dowelling it crossways under the knox form I figured opening and gluing the crack itself was not over important.
Also need to work on my wood skills so the holes turn out neater.