Yeah, I agree with Ron. There really is almost no difference in build time for what I've done so far, other than a small amount of time saved for a smaller fuselage probably. The kits are almost identical timelines for my amount of work I put in. The wiring kit will save you some time, but if you don't keep things stock, it could actually COST you time. My entire wiring on my RV-10 was 100% self designed and wired and I took about 250 hours to wire the entire plane and panel. In the scheme of 1500-2000 hours, that's not really what I'd consider a large amount of time for any custom panel. You will probably save some in the doors/windows/cabin top time that the RV-10 has. I haven't built a bubble canopy though, and maybe there are some challenging aspects there as well. At any rate, if I were to venture a guess, I'd say the RV-10 would take a person maybe 300-400 hours more than an RV-14, which in the scheme of the build I don't think is significant. It took me 1700 to get mine flying. A couple hundred more to have the wheel fairings and everything else 100% done maybe.
Tim