Yes
No
To do what you're thinking is a lot more involved than just laying a sheet of carbon cloth on it and resining it up. You need to start by protecting the dash (foil, gladwrap, tape depending on the chemicals you're gonna use). then spray it with a coat of gelcoat, then lay fibreglass on top of that. once the fibreglass has started to tack, you might wanna build up some wood reinforcement so that it holds its shape when you pull it off the dash. Once you've got all that done you'll have a mould, which you can use to make your plug (replacement dash).