ok cool thanks for that.
when im finished making it ill put up a pic and see what people think

oh i dont plan on going any where near that much.
i just wasnt sure if it changed when filling with air as opposed to co2.

ok cool thanks.

Oh and if i have a 60L sodastream cyclinder what would be a safe air pressure i can put into it with a air compressor?
The bottle says 250bar but i highly doubt ill go that high.

That look awsome!!!

What size pipe did you have to buy for the barrel?

I'm trying to built one like your's and having a bit of trouble working all this out, this will be my first go at making one.

Any help/pointers on the making you'd be great.