I haven't thought about that yet. The framework is solid so it could possibly be boarded in and windows installed to make a good large shed. But for the time being we have no plans for it, and its not going anywhere!
Yes I tried a tarp at first, with the same results as you report. Then, after the wettest summer on record in 2009 we got it covered in clear plastic corrugated sheets and a proper gutter, which have lasted 14 years so far.
I’m not sure if this counts as a mistake or not, but it felt like one at the time.
Back in 1978, eldest daughter was crying herself to sleep (or trying it on) because she so wanted chickens, so we bought a brooder etc and 8 sweet little tiny Silkie chicks. All survived our loving and...