Fiberglass 1/4's and hood?
Are you finished with the rest of your set -up? I would concentrate on getting more important things sorted before going after weight reduction.
I would say it is not worth it………….
Also, what are "good times"……… You may want to re-think and try to stay in a class that you can be competitive in.
Personally….. I would rather do well in a stockish class than be dead last in the "who can out spend who" class.
Do you know that stock Miatas dominated SOLO 2 for a long time……..