Robin, there is a fairly simple and lowish cost solution to your issues with having no sight glass, an issue which I too also dont like, but not everyone needs/wants this function or has the funds to pay the extra for it. Thats added to the fact that in the location when BSH intend the can to be housed, there is no room for a bigger can.
In the location in which both I as you know, and you have located our cans there is plenty of room for a bigger diameter can, with a sight glass....if you want to change the can for a nice sexy carbon looking can with a sight glass, I can offer this for not much more than the tow loops....
Rightly pointed out, I also believe a move away from the LHD mounting positions on all BSH engine products needs to happen if they are to maintain a good rep over here - some people will get fed up with their products not being bolt on, hassle free kits if the LHD issues are encountered too much over here. I am speaking to Phil@BSH to make this clear today.
I can see your points raised in this thread and the other but as people have pointed out, the information was there, along with detailed information and pictures on the BSH site prior to the purchase, but an 'upgrade' to a more comprehensive can wont set you back a great deal at all.
If I can be of any help or assistance in this department, do let me know.