I'm trying to get my head round fitting my headlights to my locost....
Any suggestions on what shape / size / of brackets to use ?
Does anyone have any photo's of what they have done ?
Any suggestions welcome.

Just use a bit of thick bar steel, then weld it on. Thats all that Tiger have done on the Avo chassis.

The headlight bracket strength depends partially on what headlight you go for and how high you mount them....

If you use mahusive headlights like me and mount them high up (otherwise they clash with the cycle wing on extremes of turning) you need to make the bracket pretty strong....