welcome to the forum and minibikes are certainly a cool way to make memories and teach skills to your boys, the choice of bikes might be tough depending on your fabrication skills and originality means nothing on that bike so whatever it takes to get it rolling with a power plant will have them hooked,and seeing that there is 3 of you your going to have to buy more bikes anyway lol, next time you find something get on the forum and ask some questions before you buy it, have a good time and share some progress with us, there's alot of answers here, enjoy.