Yeap your right about the lock.
You can't see in the images but I have cut a little out of the frame stops but will need to beef them up a little

Because this is a blind build things wont become obvious untill other things are done first.
Major frame mods left are (in no particular order):
1. align and make spacers for the swinging arm
2. weld the rear suspension mounts
3. adjust the rear V so that there is not a huge space behind the side panels.
4. mount the side panels
5. mount the tail piece and rear light assembly
6. mock up a seat
7. make a couple of engine mounts
8. mount some handlebars (not really frame but would be useful

I will probably start working on the engine at the same time as I would really like to pull it down a check everything is ok in there.