Wow! No time wasted with the ol' grinder! Looks like a great job so far. Id go ahead with 1A and 2A, as well as the seat latch mount, but be advised that you will almost certainly need to do some welding to put back some structure, and I would say the gussets at the shock mounts could be done away with providing the tubes are properly welded afterwards. I removed mine, but made new nicer looking ones and replaced them. You will see what I mean if you trim all that up, just be warned that you will have to replace some of those stampings with some welding and new metal. I never have figured out what the large hole is for, (fixture for the factory?) but the threaded hole for the grab bar you don't need unless you can use it for a fender mount or something. Pretty much everything else can also go unless you think you might use it for something else. 4A for the side cover, but you already took off the upper mounts so. . . 7A for the oil tank, but you already took off the upper mounts so. . .Don't know what the ? is either, so I cut those off. Hey, if anybody knows what the purpose of these things are, it would be interesting to learn. 3A centerstand mount probably not needed - most chambers can't use the centerstand. Make sure you do not disturb the lower rear engine mount if you cut off the centerstand portion!!! The buddy peg bracket tabs should probably stay. Rear sets can mount to them if you get rid if the brackets, and usually you will mount the chambers from the stock brackets or rear set brackets that mount to the frame the same. You can attack the buddy pegs with that grinder too, and clean them up, but you still need to mount your exhaust. Speaking of which, you can also remove the forward stock exhaust mounts. I don't know of any use for them except for the stock pipes.
Don't understand what 6A is. I have at at least half a dozen frames here, and they are all just the tube there. ??
Looking good so far!