Well, for decent jungle terrain have a look at the various jungle pieces Grimm did. That's basically what I did, only I never feel I've come even close to his pieces.
As for the rules, Björn and me have been doing quite a bit of work and I hope to get them presentable later this year (and we are talking LATER). Till then we'll be doing a lot of fine tuning and playtesting (or so I hope). ANd we have to check, if there is actually a game out there that actually uses the same mechanisms, because in that case I wouldn't want to spoil anybody else's work.
I've never played Songs of Blades and Heroes nor read the rules. I hope my little thingy won't be too similar... Time to do some checking, I guess.