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Any circular saw will tilt the blade compared to the base so that's covered.
Box finger joints would be a reasonable connection system. You could stay quite chunky and only have 4 or 5 per corner.
Glue and screw would also work. Splined mitre joints would be a fancy but possible alternative as flipping 45° ish cut edges will give you an exact 90° joint.Buy a cheap oil stone and some 3in1 to sharpen the chisels.
You will likely need a finer tooth circular saw blade for finish cuts.
Where are you based. Some local forumite may be willing to help with irl advice or tool loan?
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You will likely need a finer tooth circular saw blade for finish cuts.
Will these be okay or is it one of those it's worth spending more on? Blade that came with the saw is just 16.
https://www.amazon.co.uk/gp/product/B083M82K2W/
thanks, didn't know about those joiners, bit more than budget allows atm but will set up some ebay alerts. Dowel jig looks decent though, presumably can be used in general for drilling perpendicular holes?
The groove is going to be the challenge..I was thinking I'd probably have to saw it in half at 45deg and just flip one side over. Piece will probably be too wide to use the mitre saw but maybe you can do it in 2 cuts if you flip it round? Otherwise will have to see what features the incoming circular saw has and just clamp (oh..clamps!) a piece of wood to it