My first real build (Mary J Ward) has the mast passing through a deck beam and is then footed in the bottom of the hull. The shrouds are largely decorative.
Looking at the plans
Also if I am misreading the plans please advise me.
On Sheet 2
On the side elevation of hull.
Just forward of frame 10. The mast seems to foot into a tube of about 9cm. If this is strong enough, and the mast strong enough, you will not need stays or shrouds.
This would make the back stays decorative, so you either omit them, stow them (see below) or make them out of elastic.
On Sheet 4
On the side elevation
Just aft of frame 14, and directly behind the saloon roof, there is a 'Hook for aft backstay when sailing'. In line with what Colin said earlier. In this case you could stow both of them for sailing and use them to stop the boom from swinging out when on display or moving.
Vaughan Williams book mentions the compromises of scale vs practical sailing, with standing rigging.
Please feedback on this as I will have the same issue in the future.