I'd say give it a virtual try :) Fusion 360 is a horrible cloud lock-in, but it's also cheap and feature complete. Custom injection parts are expensive, but th

I'd say give it a virtual try :) Fusion 360 is a horrible cloud lock-in, but it's also cheap and feature complete. Custom injection parts are expensive, but thin sheet metal you can cut at your local hackerspace. And now just try if you can design the mechanical functionality using only off-the-shelf screws and sheet metal parts with easy bend sequence. The control stuff is easy and cheap. KiCad is your friend. Once you have a prototype showing the rudimentary mechanical parts, you'll have a much better idea of the work and costs involved. Plan for about 8x mark-up from production costs to end-user price. And last but not least, many projects die because they cannot access the relevant market cheaply enough. I used to sell bikinis online, which was fun and profitable in the beginning. But once all those other boutique fashion brands started spamming Instagram, acquiring customers became too expensive so the entire operation wasn't profitable anymore. So try to estimate how much it'll cost you to advertise to prospective customers.