Hi, thanks for the reply. Yes it does use the spreader/spacer, and no I do not have that in yet. I was following the order in the construction guide, the third step is "tie the hull and insert bulkheads", thats why I was puzzling over it. The next steps are to install the inwales and put in the temporary prop. I will wait till then and hope for the best.
It doesn't say this anywhere, but I assume one function of the cockpit doubler is to help the bottom hold its curved shape after the tempoary prop is removed.
Jim