Today I mounted the pop top. Quite uneventful session, and everything seemed to work very well, except the anticipated problems with the upper bolt heads being too wide. I have planned to cut back half the head as button head bolts in the required dimension was not available.
Testing pop top functionality:
I proceeded with making up an aft beam mount anchored jig to control the main traveller position. Then I cut the brackets back to the required size and tacked them to the hull.
Temporarily kept firmly in place with a screw with big washer on each side. The traveller is only clamped to the brackets. This means I have to laminate the traveller to the brackets partially up side down, which is definitely undesirable. The alternative seemed even less tempting, as placing the brackets on the traveller in the exact correct position and angle was very difficult. I think this way it will be better, as I can avoid any tension in the system.