pics or it didn't happen lol

OP: Builds are way more $, as everyone has said, just price all the parts in a spreadsheet and you'll see. As in, building up a BI frame would cost 2x what a BD complete would, unless you have parts lying around, are getting used bits, or are a supreme sale hunter. When you buy a complete, a lot of the savings of the wholesale parts gets passed on to you, you're basically getting a bulk discount, plus the assembly/knowledge/tools etc all are basically free. (although a BD pre-build is not idiot proof, you still need to at least tighten the cog+lockring and be sure the headset is adjusted right and wheels trued).

The advantage to a BI frame though is you can get logo-less, or that chromed KiloTT Deluxe. And it'd be very educational and some would say satisfying/fun, just get ready to drop $$.

I would also like to speak against a common notion that the parts on stock bikes are "all crap and must eventually be replaced". It's not the case. I can't speak for BD bikes (and neither do I recommend them if you're on the fence or just starting out), but contrary to what many seem to believe, you don't need all cream-of-the-crop parts to have a sweet ride. Completely decking out a bike is only for bragging rights, or track racing, or people with more dollars than sense just imo. A stock Steamroller doesn't look like much on paper but it's plenty of bike for most people, nothing on it is "crap". Even BD bikes, if you replace the pedals and saddle, and make sure the wheels are true and everything's adjusted/tightened properly, I'm sure you can get many miles on it before needing or wanting to upgrade anything else.

YMMV