It says in SA OC Siman 537 that one is allowed to do a malacha on chol hamoed if it's a "davar ha'aved". That is to say if the person doesn't do the malacha now it will come to a loss ("hefsed".) ...
I'm wondering if anybody else has experience writing their own Sefer Torah, how long it took them and how much it cost. It took me about 9 years and about $3,500 to write mine.