I have a 1-1/2" TC sight glass that was crammed with 3oz of hop pellets. I wouldn't advise trying that much in that size sight glass. I also do the CO2 purged dry hop addition method with this. IME, 2oz of hops gives my ales a very nice additional hop flavor and aroma where I want it. YMMV.
@McMullan Absolutely zero chance in hell I'm lifting a filled kegmenter into a chest freezer. I was able to get my tall 1/4 barrel kegmenter into the fermentation chamber. That's with the top opening (gas springs) as well as the end being a door for easier access. The time we used the 1/2 barrel kegmenter (for a 12 gallon end volume batch) was not something I'll willingly repeat. The ease of moving the conical fermenters (since they're on wheels) makes it a slam dunk. Plus, I brew alone these days so everything has to be setup with that in mind. I have the can filling/sealing system setup on a rolling wire mesh cart (stainless) so that everything is right next to each other. The majority of my changes, over the past year or so, have all been geared towards making the process easier on myself. Including going electric for the HLT and BK, along with a very nice control panel mounted to the brew stand.
My current brewing and fermenting areas are all on the same floor/level. When I move (hopefully this coming year) I'll be looking to do the same kind of setup. Since I use electric, along with a steam condensing lid, I don't have to brew in the garage, or outside. If I end up brewing in a room that doesn't drain to the outside, I'll look to put in a dry well (at the very least) and/or floor drain to take care of that. IME, with electric you have a LOT more options for where you can brew safely. With the steam condenser lid options available, that means you don't need to invest a ton of money into a hood setup.