ummm prolly that google program, er sketch-up? I haven't used it in years, but I hear it's come a long way. Free or cheap or whatever. Free version, not sure the limitations. Pretty sure it has a full trial for 15 or 30 days or something. Otherwise, if you are spending money, auto-desk, it's what I've used at work, but on the company dime, it's expensive. That and bobcat which I don't think is around any longer. Otherwise search sourceforge if you want full function free, I think there were a number of good ones there.
Other alternative is grab a paper, pencil, couple rulers (one extra long), a board, a string (optional), a square (triangle ruler thing) and have at it. Put together a makeshift drafting table. I'm sure there are some quick drafting tutorials on youtube, I took a few semesters of it in HS a long time ago, it's not hard. Just understanding to project the angles to build side views and all that, just takes a little basic understanding.
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