In the articles section of his website there is a good article that lists the layup. If you need some 1/2" coring let me know...I just bought a box of core cell and would give you a small piece.

Pete

:: Hi everyone,
::
:: Just thought I would ask to see if anyone else has been
:: down this path or not before I dive in on doing this
:: repair. Basically, for what ever reason, I have 3
:: thru-hull transducers which is 2 more than needed so I
:: am planning on moving forward with repairing 2 of the 3
:: and wanted to see if anyone else has been down this
:: path.
::
:: At this point I am planning on a 12:1 ratio to be able
:: lay up the glass over the old thru-hull holes. I am
:: planning on doing the repair using vinyl-lester and then
:: gelcoating over the finished result. I have opted for
:: vinyl-lester since from what I have read, this is what
:: the boats are made of as well as it seems to be a better
:: product than straight polyester resin.
::
:: I am also planning on doing some glass lay up on the
:: inside of the hull as well both for strength and just
:: the clean things up a bit.
::
:: The questions I have are as follow though -
::
:: Is there any place where the glass weight that was used
:: in the hull lay up is noted? I probably won't use the
:: same weight fiberglass but it would be good to know for
:: reference.
::
:: Are there any recommendation on a type of glass or
:: weight of fiberglass to use?
::
:: Other than that, is there anything else I should
:: consider that I may have overlooked? Trying to avoid
:: re-inventing the wheel since I suspect there are others
:: who have been down this path.
::
:: Thanks,

:: Jason