George @gblair thank you. I'm fairly new to a cutting machine, so I'm still exploring the options. After vinyl masks, cutting sheet styrene has been one of the options that I've been experimenting with. Thin styrene sheet is actually easier to cut through than card stock, so no problem with the machine coping. The reasoning is that you can make your own "photoetch", albeit in plastic which is a plus.

I have so far tried to cut out instrument panels, cockpit sidewall detail, undercarriage covers. In reality, there's a clear limitation to how fine detail you can get, especially when cutting circular shapes. Trying a 1/48 instrument panel, my Portrait (which is a low-end model in the Silhouette range) had a hard time keeping the instrument openings circular, but the end product would still be usable after some adjustment. In 1/32 or 1/24 scales, the same instrument panel comes out fine. In 1/72, it's beyond limits of the machine.

Straight lines, as in the wing spar example above, do not present a problem. In fact, just to test it out I have downsized the said piece to 1/72 and it was still a clearly usable part.

There's a company, Hawaiian Air Depot, who is trying to offer "Styrene Sheet Metal" detailing sets for download & cutting at home. I think it is an interesting concept.
https://www.hawaiianairdepot.com/shop/p/p-39p-400-airacobra-styrene-sheet-natal-for-the-148-arma-hobby-kits