Electrical system

[amiga65]

Hello.
Please let Me know if this is fesable, I am buolding My first MB a frame mount 66/88cc HT I would like to add lights front and rear My thoughts are using a small batterie and a tire rubbing geny to charge but I wonder if You could add a sprocket to genny and use as a chain tensioner? as I recall (hav'nt yoused a tire rubber in 30 years) they create a lot of resistance so maybe a dull tesioner set up, genny for batterie charging and it slides down and regular tensioner slides up wing nuts or some thing to lock into place. Does this sound workable or am I missing somthing here?

Thanks Richard