I am seriously having a hard time understanding how one DOESN'T use a climbing wall they've built. The temps have fallen below 40, I'm not an ice climber and my hands get so damn cold that 40-45 is pushing my limits of good climbing. So, either I can drive 25-30 minutes (each way) to a climbing gym, spending time and gas and money, or get all my training done in 25-30 minutes at my own place. Where is there even a difficult decision?
So, allah, you live in Columbus, right? Not many rocks in Columbus and the Red is 3.5 hours away. If you like climbing in near freezing temperatures, my question is moot, but if you don't, where do you train during the winter? If you drive to a gym, why, if you have a wall RIGHT in front of you? Comaraderie? Do you like dealing with crowds? Need someone to show off in front of (because I KNOW you can pull down hard, I've seen you)?
The notion of buying, or building a training device (treadmill, for example) for training and then not using it seems ridiculous and more a product of the person's drive and lack of forethought (no offense, Christian). I can understand becoming bored doing the same moves over and over, but, I'm not building a wall to make it the only thing I climb, or as an example of "this is WHAT I want to climb".
I'm building a wall for training, much like I run to train for races, as well as general conditioning. Training is as fun as you make it, period. I did not attain the goals I set for myself this Summer, primarily due to a lack of training (and 2 months of travel for work). Sure, climbing on rock is MUCH more fun than plastic, but not always practical. And, when I'm driving 4 hours to get to the red and back, spending $15-20/trip in gas for the day (price dependent) I want to feel like I did some good climbing and didn't waste my time/money because I burned out too fast, whatever.
Climbing with SikMonkey and ToddC IS hanging out with friends for me, however, the PURPOSE of the trip is to climb and have fun doing it. Running out of "steam" in my forearms after only a few climbs and failing on routes WELL within my technical and strength ability, because I was spent 1/3 of the way up is NOT fun, it's frustrating.
So, buy what you wish, build what you wish and let it all collect dust. I plan on training my ass off this Winter and coming out as strong as an ox come Spring.
Huggy, thanks for the input. I had planned on making the whole structure adjustable and free-standing. I don't need to make it too big, because I'm the only one climbing on it and I know what I need/want to work. I design tubular-steel structures on a 3D graphics system all day long, so I will put the concept together before I cut the first piece of steel, then Sik will come up and help me put in some cool problems.
"I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself."
D. H. Lawrence
I'll be able to train 2-3 times/week all winter long and hit that shit HARD when the temps break in the spring. No more pumping out on 9+ 10a overhanging, while climbing strong on 11a vert/slab. I'm going to build a roof on this thing that reaches from one side of my garage to the other! MAN, I'm excited. 
