fully built
The term Fully Built has been in the Gear head vernacular sense the mid 60s and implies something has been improved for high
performance, or to withstand harsh use. Important to note: Although this would suggest something could be fullerly built, the adverb "fully" does not imply
completion, or reaching a point of "maximum potential". Ultimately a more accurate term might be "modified within my budget, and skill, but I'm trying ot downplay there's room for more improvement." Fully Built now has a more universal
application, but traditionally was used in hotrod car culture. Though also used in the import tuner community, it's often meant as derogatory eg. "That boy's snap on body kit is fully built hella fresh."