Several users are seeking reliable schematics for air compressors and resources for homebuilt projects. While there are designs available, building a compressor may not be cost-effective compared to purchasing a second-hand unit, especially considering safety risks associated with pressure storage failures. A common design mentioned is the piston-type compressor, similar to a 4-stroke engine but with simplified cycles. Finding detailed cross-sectional diagrams may be challenging due to the competitive nature of the market. For more information, users are directed to websites like knowpressure.org, which offers useful insights.