I know that doesn't sound like much for a trike but for people on a fixed budget that can be too much. I know making your own can be as expensive as if you would have broke down and bought it. But the building part is fun and you get what you want sometimes. A fairly nice wire feed welder can be bought for around $250.00 then you can build to your hearts content and learn how to weld a talent that is very handy, someone always wants something welded. They will sometimes pay you or at least thank you and or buy you a drink. Coffee anyone?
Deacon the wire feed welders will work on 120 volt so you will not have to wire up a 220 volt outlet. Lowes and home depot sell them I don't have one but someday I will. I like the gas welder now. I also want a plasma cutter and a wire feed or tig welder. A good metal lathe and a good mill someday that is my wish list. A dremel tool is priceless. I'm rambling now so I'll stop.
Norman

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out