Alright alright.

Other than that, can you recommend me linear actuators that i can use on my robot to lift a 15-20kg robot?. i will go with biohazard like 4 bar linkage on my other bot.
Please link me something from here-
http://www.aliexpress.com/store/108393

Basically,
i am thinking of making something easy and cheap. you tell what is a good idea for a beginner who just did wedges?
I have tried 4 bar mech already using some kiddo mechanical kit, it ran pretty good.