As part of one of my current projects, I've got just over 20 some bikes to finish for a friend of mine.
This guy in particular needed his arm repaired. So I not only do I do new custom work, I do repair work as well for those interested. I've actually got some Imperial Guard troops I'm working on for another guy where I'm painting shoulder pads and I'm doing a little bit of additional "repair" work on them as well.
So far, I've got the 3 attack bikes done. To make them consistent with the regular bikers, I added flying bases underneath them. It allows me to add some basing to the models so they fit with the rest of the force better now (at least visually). And... it doesn't increase their footprint any so it's got no real in-game effects other than making them look good.
My Project Link: Space Marines Commission