Bob
I have 2 Athern F7s with DCC and sound if I run both of then of them in consist  They will kick out the breakers . If I run 1 with sound and 1 without sound  it is okay. That is the max that I was able to run with the 1 amp power supply. The sound decoder draws al ot of amps.
Don

Jack
Do any of your locos have sound ?
Don

You can purchase toggle and push button switches which will light up when centred.
Don

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If you push no.1 the bell will ring until you push it down again to turn off the bell. Some commands are push to run and then push to stop. Other commands are push to start and shut off automatically. You should be able to operate 90 % of EZ command with a mouth stick in my opinion . The push buttons are fairly large . You may have to do some adapting the speed control which is a dial and fairly large.
Don

I used to be part of the Antique  Outboard Motor Club . As part of their website the ran a classified ad section . I think it might work with this forum. Have a look.
Don

Everything comes apart with a big enough hammer.
Don

There is usually enough rail projecting past the bumper that no connector is neede . Just solder to the end of the rails.
Don

Bob
It looks like a layout with a lot of potential.
Don

Rick
It seems that a lot of us are handicapped one way or another.
Most locos have the connection from the tender to operate under DCC with the wires and plug as shown . This a general statement because there are some variations in the configuration. If you want to install a decoder in your 2-10-0 you will have to remove the cover on the tender , take the plug out of the circuit board and in place plug in the decoder . Suggest you use Bachman decoder to ensure compatibilityand then reassemble.Put it on the track and test it . Hopefully if all goes well it will work as it should . I have given you a fairly simple explanation . Others may fill in the details.
Don

It would also be nice if you showed up at the Calgary show.
Don .

I have been known to haul a couple of railway speeders behind my truck . and a couple of times I have 10 or so outboard motors so I guess if I put my mind to it I probably could.
Don

I just purchased a 2-10-4 and in the box was a sheet of paper with the instructions that it should not be run on anything less than 22"
Don

I have a 2-10-2 That runs fine on my 18"curves ,no driver slapping . I have a 2-10-0 that has to fight its way around 18" curves. Maybe I should give it a slap.
Don

 I suggest using trailer wiring wire for the bus wires.  . It is stranded , comes 2,3,4 wire  16 gau. For the leads I use alarm wire , 2 wire 22 gau. . I find that this makes the layout wiring a little more efficient
Don