One of my friends had a 326, similar but earlier design. I liked it. The 526 was on my own shopping list but I bought a Decathlon. Australia is a long way from Zlin spare parts but there are quite a few examples in the USA. Some have Lycoming engines which I would prefer.There was an article on Zlins in Sport Aerobatics magazine earlier this year. If you can't get a copy let me know and I'll scan it and email it to you.
March Issue
I suggest that you contact an existing owner of a 526 for advice. eg the author of that SA article - Dave Hirschman.
Regards,
Dave Pilkington