Quote from: Raj Sri on Today at 06:16:06 PM

The Raspberry pi air gap is a great way to store if done right but for me the bulkiness would be an issue. The whole setup would require just added cost which does not benefit the issue. I still really feel as the issue isn't just in mine why of privacy/security/trust/design, etc.

There are several wallets and signing devices made from Raspberry Pi Zero, and some of them are really interesting projects, but it's not that easy to purchase Pi Zero 1.3 now and price is higher than it was before.
You should also count in all other parts that you need to buy to assemble all together, and ask yourself if you have the skills and will to do all this.
One bad thing about using Raspberry Pi as signing device is that it is much slower to boot than regular hardware wallets, reason is I think it's using modified linux os