[@Crowvette]
For House Machina, think of them as programmers and engineers who speak to their summons in machine language or whatever language the tech uses to operate (could be something alien). So for tech invokers, the intelligence would hold a bit more weight than the physical, though the physical does tie in.

Invoking a small drone or android would be easier than invoking a much larger one with similar capability. Invoking alien tech even on a small scale is much more difficult than invoking something that was conceived by humans.