thanks blsswlf for the suggestion. I will look into it.
i'll try another question, this one regarding the interior of a nacelle. Is there an official or a most accepted version of the inside? I was thinking about combining elements from these sources: Constitution blueprints, Jackill's seems to have two versions. Found a simple schematics in Schmidt Starfleet dynamics also.
I think it's blssdwlf who came up with a design with moving parts at the end of the TOS nacelles. Found this very clever. Mind if I borrow your idea and incorporate it in this model?