I've had a lot of success with building aws lambdas with the https://crates.io/crates/crowbar crate. But one thing I found myself repeating was a pattern for api gateway lambdas.
I published an extension of crowbars work which adds specific emphasis on api gateway using the standard https://crates.io/crates/http crate called lando! -https://github.com/softprops/lando
My workflow centers around the serverless framework so I've also published serverless plugin to help facilitate smooth rustlang integration with the serverless framework, https://github.com/softprops/serverless-rust, which should also work with the crowbar crate.
I like to use lambda for prototyping quickly and wanted a way to easily recreate this setup and didn't want to reinvent the project templating wheel so I also open sourced a repo https://github.com/softprops/serverless-lando that supports the servers framework's built in template conventions
I'm still iterating on the rust interfaces but am looking for feedback!