TC3, thanks for the complement.
Yes, for your weight, you should be fine with similar parts. The problem I'm sure you run into is that for your height, all the parts are bigger and therefore heavier. You'll notice the difference in tire weigh more than anything. Moreover, sticky-type tires will also feel really heavy and slow. Like E mentioned, it helps to have a couple sets of tires to have the most ideal tire for the ride (you don't need big, sticky tires for a fireroad cruise).
The red chainring bolts on the chainrings or derailleur hanger? (they're sold 5 to a kit)
When I first built the bike (picture posted on the "Nirvana" post), I had CrossMax wheels and light tires. It was probably sub 27. Unfortunately, those wheels are way to light for me. It was amazing how much more precision my steering was with the beefier wheels (generally recommended max weight for the CrossMax wheels is about 160#).
Weight isn't the only factor. Riding style and terrain play a lot into it. While drops are certainly hard on a bike, attacking big studder bumps is really hard on bikes (casing double jumps is really bad - trust me).
The parts that really scare me are those made from carbon fiber and (not related to weight) are chains that are more than a year old. Another thing of age I worry about are handlebars - more than a couple seasons of aggressive riding and they should be tossed.