Yup - It's an Enterprise. 13' 3", IIRC bow to transom (possibly 13' 6").
I'd like to say 'it was the thickened transom that confused me' but actually it's more like old age*, and it's that odd hybrid with a buoyancy tank forrard and bags under the side seats.
Stupidly, I was trying to work out from the pics where the transom scuppers came out (nothing visible on the stern for now-obvious reasons!).
Several thoughts follow:
1. Definitely check the centreboard trunk. It is very hard to let new in wood there and one of the first parts of a new build, so equally hard to cut out/replace. You might be able to graft a new one onto the keel if it's sound -- I defer to those who do this for a living!
2. I'm morally certain that buoyancy tank bulkhead is a long way into the bow (ours was further aft by possibly 2-3 inches). I'm sure it is installed as intended, but that means less volume than ours had, so if swamped the bow will sit lower. If you can't seal it, you might get a bag into the space, but if you really can't seal it, cause to worry a bit...
3. You really want bags under the seats for safety (even if only for use with an outboard), and they will need solid wood for the anchoring straps, but...
4... I used to have the plans for wooden side tanks, replacing the need for bags altogether. Our boat had them, and with big hatches (about 6" diameter) they were very handy for putting lunch and dry socks in... They're only thin ply, but they do add a bit of weight compared to bags. That said they are hard to puncture! You might get the plans (or a link to them ) from a Google search or the class association. I have some room clearing to do, so if I find the plans I'll say so.
It does look like a huge amount of work though.
5. You may be disappointed with the behaviour when using an outboard. Ents weren't really intended to have them. The transom scuppers would ordinarily be out of the water (the keel very nearly is, too, at the stern). Put a lot of weight right at the back, and it will lift the bow quite a lot. The splashdeck is only there for the amusement of skippers - designed to soak the crew as effectively as possible, and if going through a swell she will take on quite a lot of water. So a bailer is important (as the transom scuppers are blocked, and anyway would be down in the water). Self-bailers would be fitted next to the centreboard trunk, but they need speed and let water in at slow speeds (we didn't use them when racing, because of the drag, anyway, and I was never convinced they worked very well).
6. You might want to consider fitting rowlocks, or at least sockets for them. Most dinghys have paddles rather than oars, but nobody expects to go miles using them. If your outboard gives up somewhere embarrassing, you might be stuck otherwise. It'll look silly, but it ought to work.
E.
PS: You probably know that fibreglass Wayfarers allow you to put lunch and dry socks, etc., in the aft buoyancy tank. There is a big hatch. That's really handy for days out.
*The "hounds" are the shroud fixings up the mast, too! Can't remember what the shroud plates are properly called (where they meet the deck), but they take a lot of strain.