Arno's Arcane Atelier

You conjure an extradimensional dwelling in range that lasts for the duration. You choose where its one entrance is located, though the portal always leads to the same extradimensional dwelling. The entrance shimmers faintly and is 5 feet wide and 10 feet tall, with a sign indicating the shop is open or closed. when the sign reads open, all may enter the portal, however you and any creature you designate when you cast the spell have access to the workspace within. You can open or close the portal if you are within 30 feet of it. While closed, the portal is locked as though the spell Arcane Lock has been cast upon it, using the same designated creatures as the workspace.

Beyond the portal is a arcane workshop. The atmosphere is clean, fresh, warm and magically ventilated.

You can create any floor plan you like, but the space can't exceed 5 cubes, each cube being 10 feet on each side. The place is furnished and decorated as you choose, the one constant is a workspace which takes up 2 of the cubes. 1 near-transparent assistants attend to your needs. You decide the visual appearance of these assistants and their attire. They are completely obedient to your orders. Each assistant can perform any task a normal humanoid assistant could perform, but they can't attack or take any action that would directly harm another creature. Thus the assistants can fetch things, clean, mend, fold clothes, polish weapons/armor, take orders,  and so on. The assistants can go anywhere in the workshop but can't leave it. Furnishings and other objects created by this spell dissipate into smoke if removed from the workshop, however items added to the workshop from outside can be stored within 1 cube and can be rearranged as the workshops portal is created. When the spell ends, any creatures inside the extradimensional space are expelled into the open spaces nearest to the entrance.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the spell creates 1 more assistant and 1 more cube of space for each slot level above 3rd.