Nice bit of grime in there, eh? Be glad I took the pic *after* vacuuming. There is a small, non-draining depression evident, I would assume at the forward upper edge of the encapsulated lead. I will fill the depression in with foam (glassed over) so that it drains properly.
You can see an old water stain on the hull just a couple of inches below the plywood, which is the same level as the main cabin floorboards. It appears as if someone had a water problem sometime in the past 40 years, one not repeated, thankfully...
I also found a receipt in there, wet and dirty in that small depression (along with various other grunge). It came from a company in Maryland, and is dated 1979. It appears to be for labor on a "heat control valv" (sic), so I don't think it is Ariel related. If it is, I plan to turn that sucker *up* when I find it. But whatever it was, it cost $28.37 to have done.
OK, here's what it looks like looking forward from down inside...