The way I look at it, it would be a labor of love, however 1/20 isn't that far away from 1/18th and 1/18th is pretty close to 1/16th. Yeah, I know I'm stretching it a bit ( a lot?). For a pro-mod, gasser, etc. the car only has to be a reasonable facsimile
I don't know if the lights rotate or not, I really don't like looking at it as I may be tempted to start it ( and finish it)
For about what I paid for the kit, You can get a really nice diecast in 1/18th from http://www.modelcarsales.eu/