Welcome! Lovely place to have a Chinook
I have the Club Lounge plan as well. I have had both of the chairs and bases in and out, as well as the furnace and the table. I have posted photos in other threads if you want to search them (furnace removal). I didn't find it too hard to remove/install. I can think of a number of ways I might accommodate a second sleeper. I'll just mention a few:
1) Maybe a bit unconventional, but a Thermarest type inflatable sleeping pad (~25" x 75") fits perfectly on the floor between the sofa and the club lounge base boxes. Then just lift it up in the morning, Japanese style

- nothing else is affected for daily living.
2) Remove Club seats from bases, attach cleats to sides of bases in the center (or just lay a board over them) and then put foam on top. Instant 24" wide, 74" long bed.
3) I have seen where someone essentially took those two base boxes (without the chairs) and built them up to be the height of dinette seats. Then they put an adjustable height table in between. The table lowered down at night and voila, twin bed. Not as comfortable as the club chairs in the daytime perhaps, but not much different than many booths.
4) There was another Chinooker who made the Club chairs quick release, then put them in the driver/passenger seat area overnight (to me they are a bit heavy for that!).
5) Some folks just go all out and make a twin bed on that side, then use a table in the middle.
I have an arrangement right now where I kept the forward club chair base, but since I didn't find the club chairs all that comfortable, I got a take-out folding seat from a mini van and mounted it there instead, to the original swivel. Now I have a headrest (ahhh), arms, and a reclining back. Slides forward/aft just like a car seat (and like the original club chair). I can also touch the floor now with my feet (the Club chair was a bit too high up for that; I think the furnace drove that height). It's small enough to be removable (back folds flat forward onto seat), so that might play into a plan? I then put in a more normal sized table (removed little wine bar thingie) that is around 24" x 32" (although not square on aisle end). I'm just reconfiguring the aft seat base, but the plan is to just make it a bit higher so it is like a "booth" type base seat. I didn't use the second seat and wanted a bit more space there for other purposes, but with the ability for someone to sit there at times.
Maybe this gives you some ideas.
BG
PS: Not sure if you have looked underneath yet, but you basically only have two things to accommodate there.
1) Under the forward seat base is a (tightly fit) furnace. I removed mine, but that's because I didn't use it and wanted more storage. It can be taken in and out, although the first removal requires reaching some screws that require a bit of cursing.
2) Under the aft seat base is part of the wheelwell (not removable!

). I think later versions may have had the safe there (mine is under stove), and/or a central vac.