I just recently bought a bunch of these: http://titaniumprocessingcenter.com/titanium-products/titanium-rod/ and am looking to build a fun playset for my kids. I'm excited, but it's my first big project and my welding will be put to the test!
Wow! That is seriously amazing. What a unique and personal idea for a gift. I'm not surprised she loved it. You should consider making and selling those!
I had a similar experience. I actually found that I preferred my bike. I had to learn to make my welds a little cleaner, but I bought parts online (http://titaniumprocessingcenter.com/ actually) and knew exactly what was there! Definitely go custom when you feel like you need the better fit!
I hate to be "that guy", but I would definitely consult a professional. I would hate for you to do it wrong or have some calculation off and have a major problem on your hand. You can even double check with the inspector. I just wouldn't do it without a professional second opinion.
If it's made out of cinderblock, I definitely wouldn't think twice about it. I guess the types of creatures that will live in there will differ, depending on your location. The worst I get is squirrels and snakes. If it bothers you that much and you don't want to spray, like others mentioned...
Duct tape.
Just kidding...kind of. I also love titanium from http://titaniumprocessingcenter.com/ and my plug-in drill. I don't know why I ever thought a battery powered one was a good idea with the work I do...
I third the hammer. It almost always works for me. Sometimes it leaves behind some staining or very small pieces, but it does a good job without a lot of money or hassle.
This is HUGE! It looks good and I bet you're getting excited to see the finished product.
For the water problem, could you just turn the water on at the main water supply line to the garage when you want to use it, and then turn it off when you're done? This would require installing the valve...