Fixing the internal pieces of the Frugel-Horn

Has anyone routed a rebate into the insides of the side panels as per (I think) the flat packs. ?
I'm building from scratch and could just glue them in place, but thought about trying this.
I only have basic diy tools and can do one side easy enough probably, but what would be the easiest way to mirror it perfectly on the other side?
Short of a lot of measuring and marking, is there an easier way?
Thanks..
Rik
 
Thanks Dave.

The question is, what's the easiest way to make sure the rebates are identical each side, given I only have basic tools.?

I have a tape measure, 4ft spirit level (which I use for a straight line), metal right angle or square, and not much else.

I guess it's just a case of measure 20 times, then cut 🤣
 
If you have some spare material, you could cut a piece which lines up with the panel edges, and acts as a guide for routing the rebates. You'd have to measure and cut the guide piece carefully, but it should make cutting the rebates accurately much easier, and they ought to match up nicely.
 
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I wonder... with just basic tools/ skills, perhaps it's more productive to set up the table saw to make perfectly square cuts and then set the width once to cut all the internal pieces (anything not a side) to eliminate potential gaps and optimize gluing strength.

if you cut dados for the interior horn, would you rabbet the other pieces into the side edges. or cut several different widths of ply,?

just tossing that out there
 
I understand that. We're on topic.

I was simply saying that with precisely cut pieces, the need for rebating is reduced or eliminated.

as well, if you butt the other pieces these internal guys need to be a different width. that increases complexity of the build.

just my opinion.