There are options for getting parts CNC machined and shipped to you. I've I needed something like this for hobby purposes that's what I'd do. I've been looking (for work) at a UK-based firm, though apparently the actual machining is done in China. Of course if you already have the material that's not ideal.

Another option that's suitable for one-off jobs and can handle this thickness in Al is water-jet cutting. This uses an abrasive in a high-pressure jet of water, and may be available locally. You'd probably need to cut to length with your bandsaw.

There are options for getting parts CNC machined and shipped to you. If I needed something like this for hobby purposes that's what I'd do. I've been looking (for work) at a UK-based firm, though apparently the actual machining is done in China. Of course if you already have the material that's not ideal.

Another option that's suitable for one-off jobs and can handle this thickness in Al is water-jet cutting. This uses an abrasive in a high-pressure jet of water, and may be available locally. You'd probably need to cut to length with your bandsaw.