Looking for input on an indoor train yard/storage

I am looking for suggestions as to how to layout the indoor train yard and storage. Below is a portion out the planned retirement house basement that has been assigned to me. I have no leeway for moving walls, etc. I must live with the space as is. I plan to run the trains in and out of here with a pass thru opening which will have a closure to seal the outside weather. It is NOT a 2 foot door, just an opening in the wall with whatever width I need up to the 2 foot. The top (north) section is 2 foot wide where I will run the trains in/out via 2 lines going thru the opening with a very little space on the west side to squeeze thru if I need to mess with any sort of problems. I know that is tight but that bench will be supported from the wall so I will have plenty of toe space. Worse case, I might add an access port on the back wall of that closet in the guest room. the bench will be built up to waist height (or other suggested input) which will match the base elevation of the outside layout. I get allocated that 7 by 2 foot run AND another 12 to 14 foot of the depth. In that area I want to have the ability for the trains to loop and multiple sidings for storing the trains and cars. I have 12 steam engines and will have a freight, an ore, a log, a passenger and a work consist to park on separate tracks plus some shorter engine parking sidings. So I’m trying to figure out how close the sidings (if that’s the correct term) tracks could/should be and the lengths for storage. My initial thoughts are to come in on the west line and loop back with the storage sidings in that 9 foot area and then loop go back out on the east line. I will have a lifting bridge so I can get into the middle of all this. My goal is to not have to take cars and engines on and off the tracks except when I take them upstairs to work on. Suggestions please. Below are a few crude mock-ups but it is finger drawn so curves are not accurate, etc.