Congrats!

And Happy Birthday!  (mine is actually on Oct. 8th.....)   I got the 90-foot turntable, and the "old" roundhouse too.  Looking forward to installing them.  I do have a couple steamers longer than the turntable, but will have a couple TT approach tracks that go straight across the TT and past the roundhouse, to park the long ones outside the roundhouse.  I bought the Walthers motor, too, to drive the turntable.  Putting a simple decoder will permit using DCC to make it run.  I don't see a need for indexing it, I plan on just running it manually.  With DCC it's pretty easy to go very slowly when you get close, and stop exactly in line with the rails.  A club I used to belong to had the linear diesel transfer table operating that way, and it was easy to align with DCC (or DC, for that matter).   I have one kit of the roundhouse, but want to get another to have 6 stalls.  I also "procured" the Atlas roundhouse kit, and will kitbash it to be an add-on to the walthers, under the pretense that the Atlas sections were built first, and several years later the Walthers sections were added as expansion. 
Now all I have to do is decide which coal tower I like the most.....

Thanks....

My birthday is October 15th.  Actually I'm going to get the Walthers built up DCC turntable that already has the motor included and has indexing.  It can also be controlled via DC with the included control box. I once used one of their older and cheaper turntables when I was in N scale and it took a lot of work to make it work reliably.  My "secret"  that finally got it working pretty well was powdered graphite. The only caution I would give you in bashing the Atlas and Walthers roundhouses is that it's my understanding that the stall spacing is different with the Walthers being 10 degrees and the Atlas being 15 degrees if my memory serves.

Michael