This is an idea for a gameplay / construction mechanic that might have been brought up in the past, albeit in a different context. But anyways, the premise for 'Prop Combos' would go like this:  Certain props that are directly welded to each other would confer a bonus to one / several / all props involved in the match up.  Unwelding prerequisite components:  Conventional types of bonuses:  Identical combos do not stack.  Weld positioning, distance, or orientation does not matter.  Example Prop Combos: (01) Frosty Friend | Snowman (Body) + Snowman (Head) (02) Bazaar Flotilla | Vending Cart Base + Fruit Crate + Fruit Crate (03) A Happy Unbirthday | Trampoline + Ball Pit + Jump Castle (04) Lost at Sea | Row Boat + Life Ring + Plastic Crate + Plastic Container (05) Sins of Intoxication | Confessional + Beer Crate (06) The Amphibian | 'Vehicle' + 'Tire' + 'Tire' + 'Tire' + 'Tire'