I am wondering what club members are using as amp covers, other than the Fender ones?
I just bought a cover for my Eich cab here :
ProtectAmp - Fabrication de housses d'amplis sur mesure
Simply perfect.
It’s a french company, maybe not the best for you across the ocean.
And, yes, the 40w is a significant addition to the 100. Just ask Goner the difference between his 100w and his 140w standalone 200 combo!