I think as has previously been mentioned that common sense takes precedence. Systems that are clearly well built are unlikely to pose a problem and are generally allowed to pass. However, as events grow and safety comes under more and more scrutiny these will become more of an issue. The rules are there specifically to cover these points and don't be surprised in the future if you need to bring a folder with you to events.

Of course there is an easy way around this, use off the shelf components. But obviously this stifles the innovation we love to see.

Even off the shelf components are more likely to fail in combat as they are not being used for the purpose for which they are intended. This is the purpose of the arena.

I think what needs looking at is the use of pneumatics/ hydraulics within the pits area as this poses the greatest risk. Event organisers need to ensure they have a robust policy in place to minimise the risk of these elements.