I just talked to them. Basically, to find out if you have to drill the frame or not, take the rubber cap off the right rear engine mounting bolt. If you see a nut...no need to drill. But if the bolt, which comes in from the left side screws into the frame and so all you see is the end of the bolt...gotta drill. Basically what you are doing is drilling the threads out so that the Nichols bolt passes through. You then use the Nichols titanium nuts on each side to tighten things up. He also advised me not to ream the engine cases all the way through, saying that there's a steel insert in there that the Nichols bolt is made to press fit, so reaming is really not necessary. He says it's easy to do...they do it for customers at Nichols for free. I expect to drill the frame on the right side using a reamer or drill bit of the recommended size, and tap the bolt through with my dead blow or brass hammer. Torque her down and be proud.
Parts should be here in a week or so.