I`d get it fixed properly, this bike is really worth spending more time and money on. A good welder can fill that up and you can drill and retap. I dropped the case of my K1 and two pieces broke off close to where the damage is on yours. I found a welder nearby and he welded the two pieces back on pretty nicely for $40. My cases were apart
I appreciate all the feedback and ideas in how to repair the broken bolt hole. In time, Id like to get it welded. There are a bunch of ways to fix this, JB weld, epoxy, braze, weld, etc. As of right now I can get the bolt to thread on tight enough to hold the cover on, but been talking with a forum member who knows how to work with this aluminum and is willing to help when the time comes. Just knowing me, Id like to have it welded some day. For now, it'll have to wait.
In the mean time Ive had a lot of bureaucratic fun at the DMV working out some issues titling it in my name. The good news, it should all be straightened out this Saturday and Ill have a title in my name. It was a whole lot easier when I lived in Vermont.
Ive made some slow progress on the bike. Im treating the tank inside and out with Evaporust. Im truly amazed at the stuff and wish Id taken more photos of the tank's inside in the beginning. Ill post some photos when its done, but any crushy brown rust is almost gone leaving behind some nice shiney metal. As it stands, I have no plans to line the tank.