Fabricate turbo kit?

For a 92 SI what exactly would be needed? I want boost but I cant afford those $3500 kits out there. I'm thinking about piecing one together and having the piping fabricated. I know i'll need to upgrade the injectors and pump but what else am I missing? I've got close to 130k on the engine so maybe I should have that rebuilt before anything. Any thoughts? Suggestions? Warnings?