I plan on doing most all the work myself and that includes evcavation and pouring the concrete. I'm looking at an 18' x 36' or 20' x 40' vinyl IG. I think I could do it for less than $15K. Am I way off here? Roughly, how long should it take? Any suggestions or feedback from DIY'ers would be great. My wife thinks we should go with an AG because they are less money but the pictures she shows me of AG's are all decked in. With all that decking the cost almost equals out.