This sounds like it requires you to align the router twice. Once to make the test piece and then again after you have got it right.

I would mill all the beads. Run a few short strips through to check your alignment. You will able to tell by inspection if it is centered. Then mill the cove. Run your short strips through first to test the alignment.

The most useful thing you can do to get consistent milling is to make your strips uniform thickness. You can do this with your router and a straight bit to make a thickness planer.

: This is the weekend I plan to machine the planks for my Bob's Special (not a
: kayak - but my next one will be). I only have one router at this time
: though, and I want to make the C&B as accurate (centred) as possible. My
: current plan is to machine a bead and center it as much as I can, then
: swap the bit, cut the cove, then cut up the plank to see how the joints
: align. I'll then use the (cut up) plank to zero the router with my beading
: bit, make any adjustments, cut another plank, zero the cove bit, cut the
: other side of the second plank, and repeat until I get the fit at the
: joint I am happy with.

: If anyone out there has any other suggestions, I'd appreciate hearing about
: them. Am I being too particular? Thanks,

: Greg.