Gardens of Babylon

Build the Gardens of Babylon with wooden pillars and walls, card mezzanine squares, aqueducts, waterproofing, reservoirs, and the Archimedes screw, using clay, stone, wood and lead.

Collect and plant sets of seedlings (points for variety and sets; like the science cards in 7 Wonders?). Special "tree" cards - collect a set, stick a tree somewhere for bonus points. Secure gold to pay for it all from the royal court, or failing that bribe officials, blackmail merchants or loot their caravans; but avoid getting caught (fine, thrown in jail miss a go, or some other penalty), and pay your thugs well so they don't defect (lose gold + random penalty?).

Survive floods, droughts, earthquakes, and invading armies?

Some sort of mechanic to make sure there's water going to all the squares, so your garden survives. Each round you need enough water: rainfall plus reservoir minus plantings minus trees > 0. if negative, lose plants + trees (and favour with court).

Favour with the court = finance, calculated by variety of plants, or size of construction somehow. If you suck too much you have to hire thugs to loot merchants and bribe officials, which might be more lucrative but more risky somehow (some sort of policing or justice thing).

Points for construction (higher layers have 2x, 3x multipliers), plant varieties and sets, trees, and remaining gold.

Can this be done so it isn't multiplayer solitaire - everyone's building the same one?