I'm going to build a new tractor for my girls tomorrow. The last one I built is getting too small. I ran into some problems when I built the first one, namely the wood cracked a lot. I'm not sure whether this was because the wood was very old or the screws were too big. So in your collective experience. 1. Can 1x2 be used in place of 2x4? In a bid to save weight. 2. What size screws should be used with 1x2? Last time I had all sorts of different screws that I found and I'm not sure if they were the reason the wood cracked.