yea its actually quite easy!! Im pretty handy personally but it really wasnt that hard, just doing it by yourself might take 3 days. I spent less than 80 dollars total for just the basic design, that is, with no stainless steel bolts and nuts and whatnot. If you want to do a heavy duty version instead of just using the twisty ties, then its gunna cost more. Let me break it down:
Using just twisty ties to hold the cage together would cost approx: 65-80 dollars depending on where you shop and if there are sales... i got some of my things on sales...most of my zip ties were on sale for 99 cents :-D
Using the Stainless Steel Nuts, bolts, and washers, its going to cost a little over 135 dollars. I used all of nuts and bolts and washers, so its pretty accurate as to how many you need if you use the design i followed. If you do the way with the nuts and bolts, then buy a few extra washers to enable you to tighten down a bit more....
The kids love it a lot! I put two 4month old female gliders in there yesterday, and they were seriously climbing to the top, jumping and gliding to the bottom, and kept on doing that for like 20 minutes lol!