Getting over the project hump

[66Dually8.1]

I have a 66 C30 that has a 2002 8.1 engine and chassis underneath it. I need two doors, who makes the most affordable best quality doors?

Does anyone have any used? Also how do the new full door skins fit?

Since I used an extended cab chassis my bed will have to be 96inches wide and 10ft long? I'm trying to decide to go flatbed or dually? Cheapest wood flatbed I have found was around $4,200. Trying to get the most bang for my buck would it cost more to customize a fleetside then getting a flatbed?