The space beneath the large GRP infill under the BR20's foredeck is difficult to access and is largely wasted. However, with a bit of amateur woodwork (pictured) this can be remedied. The middle section of this infill is hinged and folds back to reveal the space underneath. I use mine to access my battery and electrics box installation (containing charge points, solar charge controller etc) and also to keep my Fortress anchor, stowed backwards (shank forwards), ready for quick deployment. When the middle section is hinged open it gives a bit of much-needed extra height that can be comfortably sat on when using the forward rowing position. To stop it shifting about (or dropping out when turtled!), the aft part of the infill is securely tied to a lacing eye on front of the centreboard case.
I haven't weighed the wooden (marine ply) version but it is definitely heavier than the white GRP infill that it replaces. This is not a problem when cruising and an infill is in any case needed as part of the boat's sleeping arrangements. I thought about cutting up the original white GRP infill but I don't think it would then be strong enough to sit on. At least one BR20 skipper removes his infill altogether when racing under sail, to save weight.