Did you strip the phosphor off the inside of the monitor? That will go a long way to letting more light pass through. Not exactly sure how you would go about doing it without direct access to the back of the CRT display area. I'm sure some kind of chemical stripper would dissolve it as has been done for at least one LCD Mac mod.
How did you cut the neck off? With a diamond wheel Dremel tool?

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i don't strip off phosphor on monitor, i don't know how to do that, i need to try so chemical you are right.

to cut neck, i used.... a hammer got a not regular cut, than i 've put some scotch tape around cut ( to try to not get a huge cut) and slowly get it regular with a little rounded pliers with cutting very little pieces of glass. than after cleaning glass remains i put again some scotch tape to not have cutting edge (didn't have any diamond or dremel:/)

thks for the link, this is very interesting

and yes, special glass painting should be too an interesting solution