Hi Thor and John!
indeed i havent seen any spitfires without nose ballast. i have soon 20000mah batteries. so there wont be any balance point problems. its harder with gasser.
it would be nice to get maximum sound effect, i have now 5inch speaker. going to make very good sound box for the speaker. its between exhausts and instrument panel.
will see how it works. i think there would be room for 6inch speaker too. and the speaker is so front as possible. batteries will be on bottom of cowl keeping balance point lower. it should work against noseovers too. i going to laminate lighter wing soon. just received my 30kg of epoxy... and silicon for detail molds.
and i will laminate full carbon elevator and rudder. thinnest possible. today i lost coz of cleaning my workshop.

cheers

Jukka