1: Is balsa waterpoof? I imagine it being quite porous and if it is issing down wont it fall apart?
This is the bodge it section so balsa not being waterproof doesn't matter. Anyways it wouldn't be fitted if rain is promised! I'm sure the black felttip that I coloured it with will waterproof it to some degree!!!
2: is your blackberry waterproof?
No, but see above! It's a spare one with no SIM so it's not the end of the world if the worst happens!
What mods have you in mind for the mk2 version?
Double depth to hold a battery pack to extend the running time. Cutting down the lamp casing even more to slim down the profile.
Thank you for your interest!