Most of his doujinshis are listed on this site: http://www.toranoana.jp/cgi-bin/R2/d_search.cgi?bl_fg=0&item_kind=0401&mak=%90%c2&img=1&stk=1&makAg=1&p1=90&p2=39&p3=5730313233393930
And there seems to be in total 57 touhou doujinshis, which does not take the small doujinshis into account(such as this one: /g/605831/8ae71b2cd2/)
What's more, just from the year 2009 till now, he has produced more than 1700 pics on his blog, almost at the rate of one pic per day. (his blog: http://sangensei.blog.shinobi.jp/)
Extras: (1)In the year 2011, he said he was going to take the college entrance exam or something like that;
(2)Once when talking about kotatsu, he said he was not so familiar with Japan because he had spent quite a lot of time outside Japan before. And it is likely that he might be a oversee Japanese born in South America maybe. Because once he used "Muero" to describe the friendship between Kaguya and Mokou, which seems to be a Spanish word?