I used 'pre-loved' 25mm timber spars as laterals, and here I've decided to swap these out with 6 x 34 x 2400mm spars from Cheshire Mouldings (product TM681 for those in the know)... reason being that as with elsewhere on the craft there's a lot to be gained from a sliver of silicone or adhesive in terms of doubling up on the fixture of parts.
These are fitted off-centre so as to provide a lip along either side of the deck where a filet of silicone can be applied. Adhesive is many times the strength of silicone, but is an irreversible join for one thing and around twice the weight for another. Either way it should be applied with laterals disconnected from the hub and set vertically so as to prevent them from flexing, and for a really close fit you can pinch the laterals as here.