In my opinion you can probably disregard the weight limit of your top case.HA! My buddy asked me if I thought I used enough filler rod in the welds ... I told him this is what happens when you're stuck welding with an oxyfuel rig and have too much time on your hands
Looks fairly robust. So do you drive all the time without the lowers on your fairing?
Well I just got the Bike a few weeks ago, and since we are approaching summer in Texas and the lower plastics on the bike were damaged, I just took them off permanently. I've never owned a full fairing bike except my Yamaha Venture Royale touring bike, so I really don't know what I might be missing by having the lowers removed. I like it this way.
Let me know how it works for you. I am just a little south of you so it will be interesting to hear how it goes.