while building my new alpha 60 i decided instead of useing the on - off switch hole that was cut out already, i would enlarge it so i could install a on - off and charge switch together well i cut the hole a little too big and now i have a gap the length of the switch right above it its not very big at all but i can sure see it ! what do you recomend to fill the gap so it cant be seen?

just cut out a matching square of scrap bulsa, and glue it into the hole, then monokote over it. Or, just monokote or tape over the hole