Stripping what threads? If I recall, the only threads are for the motherboard standoffs.To minimize the risk of thread stripping. The NCASE M1 has had those since 2019.
Maybe not completely solid, but with reduced perforation surface instead? Personally, I'd rather have less cooling than more dust and noise (coil whine is a thing). As for the classic layout, it seems to work just fine for the overwhelming majority of PC cases out there.
The inverted layout is far better for cooling - I tried both setups in v1.
Seems like you're after a fundamentally different case - there are plenty on the market that suit your requirements.