I am not acquainted with Jade wallet, and this is my first encounter with it. I am intrigued to know how you stumbled upon this wallet and what measures you have taken to ensure its safety as a hardware wallet. Given the wallet's low price, I am concerned about its security.
In as much as I am looking to get a hardware wallet for myself at a cheaper rate, I should also exercise caution because doing so usually comes with a greater risk. As such, even if I bookmark this, I will probably wait for a review from one or two trustees, not any reviews online because they can probably be paid reviews, and detailed information regarding how secured the wallet is.
The firmware that will be used in this DIY HW wallet is from Blockstream jade hardware wallet itself. Blockstream is the developer of Blockstream wallet, jade HW wallet, Blockstream explorer, the bitcoin liquid and the devs who acquire/continuing the development of GreenAddress wallet.
It's much more technical than other existing HW wallets and more interesting to be exact as personal project. Knowing the source code of the firmware is open source and used the same on its official jade HW wallet i assumed this is audited by other developers so it's i guess its safe, only if followed the correct instructions since its more in technicality and NOT a newbie friendly.