I'd like a height adjustable L-desk with an integrated monitor stand at the very back of its short side with attachments for dual offset monitors and single/dual/triple.
It would also have a built in UPS and two workstation PCs, touch screen for drawing, audio mixer/interface/pre-amp with a set of audio monitors, grounding points for ESD mats, great cable routing for every component with built in power pass-through, diffused RGB lighting at the rear to get a nice relief giving backlight onto the walls, being able to choose the most suiting color for time of day and mood!
Well built and sturdy with materials such as mahogany, carbon fiber and stainless steel , filing cabinets, A3 printer spot, vertical mounted 4 level document tray, a triple pencil stand.. Underside heater and cooler to make your feet all so comfy..
A keyboard with the CM Masterkeys Pro M key layout on a nice light-medium linear switch, with RGB backlighting, a keypad for gaming and editing, a mouse with the button layout of the Sharkoon SZ M20 but with better build and... RGB.
Main monitor would be an industrial looking OLED ultrawide 35"-40" with about 86 ppi good color accuracy and dynamic range and the ability to use it as both curved and flat, not sure about other monitors...
Sound treated room with a bookshelf full of fun knowledge, posters of everything from anatomy and the periodic table to Spidey-Pool, two custom made motorcycles in there, one a scrambler and the other a cafe racer. True to scale models of different vehicles in display cases, a wall that'd be a terrarium for some wonderful turtles which would also reveal the kitchen and a corner designated as a dogs very own little area, a couch in another corner.
All I can think of atm...