That color looks like a pretty good match. At least as good as most companies use. I agree that something like flaps would be a good way to deal with things that protrude. I'm not sure which there would be more demand for, one with a hole for the handle so that it could be carried, or a completely enclosed cover that is more dust-proof. I would prefer the latter, myself. At least Everlast uses some of the same basic chassis for more than one product, so some covers can do more than one model. For ease of removal and replacement I would allow some clearance and not necessarily follow all the curves and angles. If the cover is hard to install, it won't get used.
Long arc, short arc, heliarc and in-the-dark!