Kostya,
There are a huge selection of rigs available for a Cherub. Current suppliers on recent new builds are
www.c-tech.co.nz/ and
www.aardvarkracing.co.uk. Selden and Superspars also appear on some very successful boats.
It is possible to go for a complete home build mast, the current recipe we used on my boat is on the main cherub site. Remember that mast building is not generally easy and I am playing about with them. I started off my project knowing that the first few would certainly be experiments and possibly break - I've broken 3 tips sailing during this experiment which feel like real low points at the time. When it works though the grin factor is excellent.
What boat are you aiming to build?