chopping the frame and finding the right seat

Heres what Im working 1982 kz305csr with 2200miles its my first bike got a pretty good deal it So from what I noticed it came with a few modifications on it Like took the original seat n brackets off etc and Really cant tell if these are the origial handle bars. Well to make this short I'm not to sure how I would like to finish the bike off to really give it that look i desire. I want to lower the rear shock n give it that hardtail bobber look But not to sure what I would be chopping n welding so i WANT TO leave that for last but any suggestions on how i can achieve that look with out chopping and also does any one know what bobber seat kit would fit just perfect for it. Its my first bike so feel free to break it down for me I will post more pictures soon