A couple of comments on using long bolts cut off for studs. Before, the bolt threaded into the aluminum engine block only as far as it had to to tighten down on the motor mounts. Now you have bottomed the new bolt into the block, which is not necessarily a good idea. It wasn't intended to take that stress and who knows how thick the material is there.
I like the concept, as removing the motor mount bolts every time you want to do an oil change never excited me. But you should be finding some actual studs for this task. Studs have a non-threaded middle section and the stud tightens down on that, not the bottom of the hole. And you don't torque them down, just thread them in and locktite them in place. Then you have a good base for the nuts to tighten on the motor mounts, though pulling the engine might require removal of the studs, should you ever need to do that.
CLICKY
And keep an eye on those nylock nuts, the headers get plenty hot. Probably not an issue, but it wouldn't hurt to eyeball them after a few rides.
A good hardware store or some place like Fastanal might be able to source you studs in the correct dimensions and a rust resistant finish.