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one of the most asked questions is: How do you get a good fit on tubing?
I use several methods including hand filing on critical joints...

belt grinder custom made for notching tubing by hand
shop made cutter for notching straight cuts on a bridgeport mill
shop made cutter for notching straight cuts on a bridgeport mill
destructive testing of .093 wall chrome-moly tubing welds
destructive testing of .093 wall chrome-moly tubing welds
note how deformed the tubing is before crack occured - over 10 tons of pressure on this weld
this test was done to compare different TIG welding rods and methods
being comfortable has a lot to do with weld quality, especially in tig welding
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ABOUT FABRICATION
Welders 10 commandments

1. thou shalt not weld on an unpurged tank, for the noise will be very loud when the tank explodes and thy friends will console thy widow in ways generally unacceptable to thee.

2. thou shalt secure thy tanks, lest one fall on thy foot and transform thee into less than a graceful dancer when called upon by thy wife or other female friend.

3. thou shalt clean thy work carefully, lest thy gaze upon thy work falling apart as it passeth out of thy sight.

4. thou shalt place thy work in jigs, or other holding fixtures, for the eye is a poor instrument for the measurement of angles and great will be thy wrath as thou art doing thy task a second time.

5. thou shalt not weld near batteries, compressed gasses, or flammable materials lest a spark from thy labors would cause thee to continue thy chosen profession in an open field or other such drafty place.

6. thou shalt take great care of thy tools and equipment, lest thy friend who is in charge of such things smites thee about thy head and shoulders for being a waster and a knave.

7. thou shalt not perform thy art without proper ventilation, for the smell of toxic gasses produced by the heating of primers, and plated or painted surfaces is worse than a bad cigar and will remain with thee until the end of thy days.

8. thou shalt not weld without goggles, nor shalt thou allow others to gaze upon thy labors, lest thy employment, or the employment of others be changed to sitting on cold and rainy streets while selling pencils.

9. thou shalt wear sturdy gloves, for burns upon thy hands are a source of great pain when thou art attempting to raise thy bowling average.

10. thou shalt ground thy work, when thou weldeth with a machine of arcs, for thou art a good conductor of electricity and the shock which thou shalt receive shall ruin thy plans for thy weekend.
Yeah.  Lets build that...
The tractor that's in your head.