Perhaps the instructions have changed but when I built mine, the manual shows the frames filleted in place before glassing between them.

Thanks.  The photos on the website look fairly recent; it's probably my instruction manual that's old - it's a photocopy of what I am guessing is the CLC manual (I bought my kit from a company here in Australia who are licensed to sell CLC designs).  My manual might be an older version.  Having fitted the bulkheads once, I'd rather leave them in than remove them and have to fit them once again.