Jarrell, I agree with Willis that a double ended yard will eat up a lot of valuable space by merging back to the mainline that could be used for longer stubs instead.
I use a stub yard, but have a combo inbound/outbound track that is connected to the yard at one end and to the main at both ends. The inbounds drop the train on this track and then the switcher goes to work placing the individual cars in the yard. For outbound, the switcher will build the consist on a spare stub and then locate it on the same I/O track to wait for the motive power to pick it up.
Also important for switcher work is a lead track to the yard ladder that is seperate from the main. About five cars and a switcher length is very helpful. It doesn't have to be that long to be effective, but the longer...the better all the way to train length. I use the main if I need a longer lead to the yard as many prototypes do.
Where is the drawing? I don't see it. All I see is Jarrell with that all too familiar look
that I have had many times
EDIT: Ah, now I see it. Jarrell, if you wanted the ability to turn your trains around, the drawing looks like it would be easy to have a reversing loop at the lower right quadrant. Just cut across from the main at the end of the yard over to the opposite side of the curve heading back towards the yard.