There is no excuse for not following through on your trade. Sorry, if you had time to get your wife pregnant, you still had nine months to build a bow you promised. I've done this trade 3 times and I'm done for awhile since I got a "hand out" bow 2 out of 3 times. I was really disgusted last year to see an old member that had just bragged about making 100's of bows get one and disappear only to be one of the worshipped ones on the Paleoplanet site and even come back on this site briefly till I called him out. Anybody that wants to know who they are PM me. We had five Ripoff Artist last year, there is no reason for that given the time allowed and unless you are dead be a man and let someone know why.
To me, there is nothing worse then a thief. And you can sugar coat it, but that is what you are doing when you take the cheap way out because your Man parts shrunk up and you can't be honest.
If you can't/ or don't have the experience, sit it out until you do. Just think it through before you commit if you care about your reputation. Because, if I can get a phone number, I will call you to find out why you didn't follow through.