Does anyone have guesses (or better) as to appropriate "design rules"
(minimum line width, minimum spacing, hole/pad ratio, etc) for various
types of amateur PCB construction, such as:

1) Draw with sharpie or other permanant marker.
2) toner transfer
3) photo-sensitive resist using printed transparency as "film"
4) etc?

(All using typical amateur etchants under typical amateut conditions.)

Any other guidelines if you're designing a PCB for hobbyists?
(no plated through holes -> vias should be on component leads where it's
practical to solder both sides, or off by themselves.)
(Drill accuracy is limitted.) (etc)

Thanks
Bill W

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