I did remove the transmission assembly but I could have removed the inner cover, removed the two bolts holding the case together and re installed the inner cover. Putting the transmission gears back was a challenge but in the end worked out ok. The other thing I learned was I did not need a crank pinion gear puller, I removed the crank and used a press, I spent a bundle on a pinion puller that did not do the job and was junk. A repair manual will be needed but you can find online copies. Hidden bolts???? hmm let me see how good my memory is.... lifter bolts inside the crank case, front stud used for the exhaust brackets, a screw is kind of hidden that hold the inner transmission cover......I may be missing something.
I picked up the pedestrian slicer back in '88, always gave her that special look.
After 25 years I sold the Triumph, tools, and manuals this last summer, great bike just was time to move on.