First, the drawing doesn't appear to have the turnouts drawn to scale, so you may find things won't fit as intended. There are some very sharp turnout angles shown.
Since you like operation, having some kind of staging for trains before they enter/after they leave the major yard would seem to be desirable. As the plan currently stands, you don't have a way to support the traffic that would be using the yard, unless you want to just have a small number of trains that get made up and then broken down again without traveling anywhere.
I also have some concern about the single-ended hump yard. There's only one way in our out, which means everything that gets classified has to come back out over the hump. This would be an unusual prototype situation, and very restrictive for multiple person operations, but you'd have to decide for yourself if those are potential problems for you.
Rob Spangler
I've been using a de-humidifier in an occasionally damp location for years, and it works great. I've got a hose from it to a floor drain. Only problem is that mold grows in the condensate and tends to plug the hose. I clean it out once in awhile, and it's acceptable to me.
On the plan: I think I'd like a hump bypass track. And it would be nice to have a turntable or a wye or something like that.
Ed
I originally had split the drawing into halves. Disregard the portion of the texts reference to left & right sides (since I can't edit these posts).
First off a little background on myself. I'm a operating kind of guy. As a former brakeman, dispatcher office operator, Tower Operator I like operation. Not really interested in industrial switching. Necessities are; 1. Double track, 2. Long sidings, 3. Plenty of interlockings, 4. A hump yard, 5. A passenger station, 6. A engine house and facilities, 7. Two levels, 8. Around the wall with accessibility without openings in the layout. Most of this has been thought of in the attached drawing (left and right side since it is a wide image and the restriction of photo size for attachments. The yet to be built room will be 10x19' in a un-finished basement with a stone foundation. One wall will be the foundation (open, no layout except for a short portion). The built walls (all wood, no cheap drywall) will have the layout in a 'self' like design. The basement get very humid anytime it rains, especially in the spring (varies from as low as 40% to close to 100%). I will have a dehumidifier for that enclosed room. I'm hoping by somewhat isolating the room on three sides and partially enclosing the ceiling I will have a handle on humidity. There is no issue in the winter other than temperature (varies from 40-45 degrees to close to 80 degrees). Other than the humidity, am I going to have a issue with 'heat kinks' and/or pull aparts?? Those figures are extremes. Temp. ranges from close to upper 40's to upper 70's. High humidity is usually short lived, except under long rainy periods (mostly in the spring). I talked to a modeler locally in HO scale and he had problems with pull-aparts & heat kinks. But, that was in HO. Is N more or less prone to this? My first (real) layout was a 5x7' modified 'L' shaped table in a bedroom. For a 1st (real) layout, my major resign fault was excessive grades, especially for the hump. MicroTrains trucks allowed the cars to literally crash into the bumpers at the ends of the tracks sometimes on to the floor. One excessively sharp curve at the top of the grade caused straight-lining with longer trains due to the grades. I have close to 250 freight & passenger cars all with MT trucks & couplers. My power rooster is 23 freight & passenger (Atlas & Life Like), all diesel. No DCC. The right side has a elevated portion that will include a passenger station with siding off either main. No, there is no 'coach yard' as I don't seem to have room for it without actually seeing it in 3d (after the table frame is built and can visualize the look as it is planned now). The left side is the hump & receiving yard with engine facilities. I changed the location of the facilities a couple of times and as it stands it needs to be change again since I don't like tracks on either side of the receiving yard 'lead'. The 'squares' on the drawing at 12". Table depth is limited to three feet, but I'm concerned about access along the long wall so I plan hinged cutouts that drop down on that wall and the far right angled corner. I don't want to reduce the depth to 30" since it will 'cram' all of the too close together. It's alot as it is.