Ok, so I tried to take the windowsill to the extreme. I've got a sunroom that I started to overtake last year with a few plants. Now, I think I've got about 50 or so in there. I mounted 1/2" EMT electrical conduit to the ceiling to rope hang some drainage trays. Each tray drains into the next and then into a bucket (temp removed) below the lowest one.
I've switched a bunch to semi-hydro which seems to be going well for the most part.
I've got lights in there too, T5s and T8s where the sun can't quite reach on the shelf. Heat mats are on the middle and lower shelves to help establish roots.
Its in a bit of a state of transition, as nearly all my paphs, phrags, and a few others are huddled together on the heat mats. Eventually they will be going in the hanging drainage trays.
If you're wondering, yes thats snow outside

The pics were taken a couple months ago. The sun heats this room up like you wouldn't believe, so sunny days in winter can get comfortable. Overcast, and the heat is cranked! In summer, I have to run A/C unless its under 25C outside where I can open the windows.
Last pic is of my office window setup. Enjoy!