Aaron, There are a lot of great posts. Here are my thoughts, some of which will duplicate whats said…
MOYG and cheap = siltarp and synthetic quilt (+1 Tim Marshall’s advice). Check out zenstoves for directions on homeade stoves. A heiny pot is easy to add for cooking. A simple pack is not hard to do either. Now all of these projects can get much harder depending on features and materials.
Here is a link to my gear list that is mostly MOYG. LytW8 MYOG Gearlist
If you want directions there are some kits that are great to learn from. For gear Ray Jardine has inexpensive kits for packs, tarps and net tents. rayjardine
For clothing and down quilts take a look at thru-hiker
A lightweight set of gear does not need to be expensive and much of it can indeed be made by yourself.
Jamie

