Names are suggestions. Sizes subject to balancing.
Bushcraft Desk: wood only = 3x3 (9 slots)
Rustic Desk: wood + 1 glue = 5x5 (25 slots)
Cottage Desk: wood +4 glue = 7x7 (49 slots, current study desk)
After this there should be better ones with but the size increases should hit more diminishing returns.
Pompous Desk: requiring glue, metal, turpentine etc. = 8x8 (64 slots, equal to Cupboard)
Opulent Desk: requiring precious metals, silk = 9x9 (81 slots)
Other Study Desk QoL:
*Indicator near study screen either displaying "no study desk" or specifying what kind of Study Desk you possess.
*Ten-second hourglass on "Take possession" -action to prevent accidental takeovers.