I am just brainstorming here. Would love to see some serious suggestions 
Hussites are all about their wagons.
Unique features:
- Buildings
- Supply wagon is an expensive (100 wood) slow mobile building that replaces the need for drop-off points
- Wagon fort is a mobile pseudo-outpost cannot be garrisoned while mobile. (Functions like an outpost but can be redeployed somewhere else)
- Units
. - War wagon, A mobile shooting platform
. - Flail zealot. A fast flail weilding unit with low armour that charges into battle. A heavy charged melee attack replenishes out of melee.
. - No knights. They are a peasant faction so no knights
. - War ready peasants carry a flail and benefit from blacksmith damage techs
- Unique Mechanic
. - Revolution can be called at the cost of precious age to convert ALL peasants into flail zealot. A temporary villager recruitment boost engages to offset the serious economic loss.
- Unique techs
- Field Smithies. Blacksmith techs research 25% faster and some techs can be researched again ( JK but some sort of tech) .
- Halberdiers. Men at arms get a halberd and do +2 vs armour +2 vs cav
- Powder mills. Gunpowder seige units cost less (12%?)
- Communal tithe. (since they broke the catholic ties (tithes)) Wood cutters trickle some gold.