Yo man, nice build so far!!! Since everyone else is throwing their opinions out there I'll do the same and say don't do this
http://emblempros.com/inc/sdetail/3445/11262. And if you are going to do it I've seen it done where it looks much better than that. Don't have a link for that though, sorry. Haha.
Also, IMO the RK Sport ground effects look good, but not as good as the Razzi. OEM ground effects (both the original and the newer ZL1 kits) look the best of all kits IMO. And the street scene kit.....looks probably the worst out of all the kits I've seen...not that they look terrible or anything.....just last on the list of all ground effects.
Keep up the awesome build, man!!