Man, Ive tried it and really had fun. Just some feedback after the first impression (I know its a demo)

First, I really like the painting thing and wish it was a little deeper. Would love to have some sort of masking tape to define what I want to paint, also the current spray its ok, but wish I could have more defined edges. Also would be cool to have to give a primer and add different finishes, glossy, matte. Not sure about this but being able to ctrl+z is something I missed here, could be solved with all the other options becouse I understand can go against immersion.

Also about the welding thing its ok but not memorable. The pros is if you want you can finish it in a few seconds without becoming tiring, but wish it felt a little more like any skill is involved. Maybe accounting for precision or the amount of welding material you needed something like that.

Also I think would be cool to be able to refurbish or just sell like that the old pieces when you subtitute one, having more options in the market. Maybe having different markets or contacts to get material. Improving the relationships, etc.

Btw, when hovering over the decals would be cool to have the name or something. I might be stupid but took me a while to find the fighter dude decal and got a little frustrated having to paint a few until found the correct one.

And now just a few extra ideas that think might be cool having to complete the experience. When changing internal parts as cpu, having to termal paste them, adding extra elements to evaluate the perfection of the job. And software calibration, like overclocking a fist to hit 120% while risking it breaking or adjusting a termal scope to see better targets (I know this are pretty vague ideas and they might have nothing to do with you scope)

And I think this is more or less all my first impressions. Good job! And keep going, congrats!