yes some small forts like Tabor ( -> taborites = hussites from fort Tabor - main hussitic base )
it had walls but very small. Not palisade like normal fort, but little walls made from stones. maybe 2m high. attackers could make them with ladders or smtn.
And without fences to cover, so they could be shot down by crosbowmens.
lol - modding work on 2 years

otherwise - some hussitic pics of weaponry and wagons - I think the hussite types of troops could be unlocked for player (In Bohemia ofcourse) after year 1350 a.d. (50 years before hussitic revolution, because in 1408 or so it will be too late to play with em). the best will be to hire them as mercenaries because they wasn feudal troops, but trained peasants (mostly) and troops who deserted and joined them

otherwise - some useful hussitic pics of weaponry and wagons:

http://www.husitstvi.cz/vyzbroj21.php
http://www.husitstvi.cz/vyzbroj1.php
http://www.husitstvi.cz/vyzbroj8.php
http://www.husitstvi.cz/vyzbroj13.php
http://www.husitstvi.cz/vyzbroj15.php - with picture of David and Goliath
http://www.husitstvi.cz/vyzbroj10.php
http://www.husitstvi.cz/vyzbroj6.php
http://www.husitstvi.cz/vyzbroj9.php
http://www.husitstvi.cz/vyzbroj20.php
http://www.husitstvi.cz/jednotky3.php
http://www.husitstvi.cz/jednotky4.php

And I think that some gunpowder units could stay. not musketeers but some early handgunners. because on that wagons were many of em