I've been lurking around here for some time, gaining knowledge and drooling on the products that DIY's have produced.
Without any access to metal cutting machinery, I found a small heatsink and designed a light around it. With all the bits and pieces gathered together to build a few lights, I decided to document one of the builds. What follows is a pictorial display of a build pairing Quazzles quality L333's and Microcool's Southbridge chipsink as the foundation.
Parts used:
microcool southbridge chipsink 30x30x30(mm)
LED/driver:
L333-MC-XPEH50-B/L333-MC-XPGH51-B
Lens:
3-Up Cree XP-G Carclo 10507
Tactile Switch:
digikey 401-1835-ND
Battery contacts:
digikey 209K-ND
PCB .5mm socket:
digikey 952-1461-ND (also used the matching pin for ease of soldering the wire on the pin)
Yellow Cable:
Canare L-4E5C Mini-Star-Quad Microphone Cable
Fasteners:
3mm stainless steel screws (custom lengths from 16mm)
O-rings for base mount and waterproofing:
http://www.oringsusa.com/
Batteries:
18650 protected panasonic Callies Kustoms (not shown)
Front cover, Base, and battery holder cast in Black Onyx from Smooth-On.com of my own design. Battery pieces superglued together.
Pic1

Pic2

Pic3

Pic4

Pic5

Pic6

Pic7

Pic8

Pic9

Pic10

Pic11

Pic12

Pic13

Pic14

Pic15

Pic16

Pic17

Pic18

Pic19

Pic20

Pic21

Pic22

Pic23