No one wants to champion the vim or rego requisites? That's good, I don't like them either (although I could perhaps be talked into a higher base level).
Our mental construct using magus or maga could go about learning a whole slew of spells like Transformation of Wood to the Realm of Thought in the previous post in order to get all of their materials into their laboratory. They’d keep the stuff in their laboratory by repeated castings of the duration Moon spell until, at some point (presumably after whatever he/she is creating has been created), all of the spells will expire at once and the materials and completed creations will pop out into the real world. Perhaps a whole slew of spells is an exaggeration, they’d at least want to learn a terram version in addition to the herbam version. They would, quite possibly, want to learn an animal version as well. Other stuff (corpus, aquam, or auram) would be less needed.
But instead of learning more spells to change real stuff into mental stuff, the magus/maga might well choose to just make mental stuff and avoid the hassle of moving the non-vis parts of their creation into their mind. There are some advantages to this. The creations are much safer than average from the possibility of theft. The stuff is somewhat better protected from being disenchanted or destroyed. The creations are exceedingly easy to transport. The creations very are well hidden. The magus can easily control who has access to them.
These is the also the significant disadvantage of the items not being real, not real in the sense that one could use them in the real world. That’s an issue that our magus or maga is going to need to address.
The inmost companion, (a spell from the core book) uses base 25 to make an entire mind into a bird, it does so with an animal requisite but no level bump for the requisite. Using that guideline, here’s an item to allow the use of all of your mental construct enchanted devices in the real world.
Gateway to Reality
MuMe(Te,He) 50
R: Touch, D: Conc. (item maintains), T: Ind.
The Gateway to Reality is an enchanted device designed to be constructed within mental construct laboratory. The gateway to reality is an enchanted doorway with glass spheres full of mercury embedded in each corner and just above the floor that stands alone not attached to any wall. With the door opened, a viewer looking through the side of the doorway from which the door is opened sees a swirling mass of silvery mist within it, an observer from the other side sees through the opening clearly with no obvious evidence of magic. When the door is opened and an object is moved through the doorway, that object is transformed into an equivalent object in the real world. At any time after this, a creature within the mental construct where the gateway to reality is housed may reach through the doorway and bring the item back to the mental construct ending the effect. Any of the gateway’s transformation effects are also ended if the door of the gateway is closed (which happens automatically at sunrise and sunset). While the items created in the real world are magical effects with a penetration of 0, if a transformed object is an enchanted device, any effects it produces have a penetration as normal. Only objects created entirely out of herbam and terram components can be transformed.
Base 25, +1 touch, +1 concentration, +1 terram requisite, +5 levels item maintains concentration, +5 levels 24 uses per day
In the past I might have attempted some good natured teasing aimed at those who don’t allow multiple effects that maintain concentration from the same item to be active at the same time, but we’ve had that discussion before and we don’t need to do it again. Your interpretation is… fine.