new and had a few questions about a rotary im going to purchase

[JesseV209]

I asked a dude who builds machines if he can build a rotary that will be used mostly for dotwork and whip shading only. Does this machine seem legit? what are some questions i should ask about the machine before i send money for it. im totally new to rotarys, i'm currently using a stealth and haven't used any other type before. any input would be great.