For those who want a padeye or something more substantial on deck, but wish to tie it to the hull with a tie rod etc, but are not doing this due to the tie rod going through a living space
(usually a bunk right forward)...
Why not break the problem up?
Firstly, describing the system I have: I have a "proper" chainplate-sized tang on deck made of 1/2" plate, about 1.2m aft of the forestay fitting. Easy to fabricate, or alternatively, just go buy a huge padeye.
Underneath, I have a similar fitting, but upside-down, so the bolts that come in from the deck side, go through the bottom fitting. (again, as somebody else suggested, you can just have a padeye on the inside as well).
I then have an attachment point inside to transfer the loads to the hull - a 1/4" "strap" through bolted through a bulkhead - but this attachment point is almost 60cm below the underside of the deck.. so I need a tie rod.
Normally, this tie rod would go through the berth.. But it doesn't always have to be there.
Break the problem up. If coastal sailing/day hopping, you won't need the inner forestay/storm jib
up. So don't tie it to the hull. (normally I'll be using the deck fitting to hang blocks off for a spin downhaul and preventers)
When about to head
off on a passage
tie the deck fitting to the hull. In my case, I have a LONG 1/2" turnbuckle which I can use. Attach with shackles, tension and voila. Simple.
Most people don't like to sleep forward on passage
anyway, so it works and causes no issues. It doesn't even matter if you need to move bedding/cushions around to access the tie point - this is only on passage.
So remember, it's not just the stay on deck that can be removable, you can treat the inside as removable as well.