To give you an idea of the project I'm attempting...

The Bogwood Rath
an adventure scenario for 5th - 7th level (4E) and still be challenging, but not overwhelming.

Basic adventure idea: the Bogwood is swamp forest - mixture of marsh, bog, slow moving rivers, but heavily forested. In times past the Bogwood was as dangerous as swamps can be, but still a "natural" swamp environment. Lately the Bogwood is turning dark, the Swamp Druid is nolonger keeping the balance (part of the quest to discover why), the inhabitants are reporting a darkness turning the Swamp into something enchanted and evil. (Dark fey have built a Rath or fey mound, near the Swamp Druid's enclave and ensorcelled him, binding him with sorcery - and taking over the swamp.)

Road's End Tavern - the road leading to the Bogwood ends at the edge of the swamp forest. A tavern here for hunters and fisherman, place to pick up clues and meet a "bogling".

17 miles of plank bridging and muddy trails to reach, "Handy's Crannog", a bogling village. Beyond this, you need a boat to travel the Bogwood.

"Boglings" (swamp dwelling halflings on stilt homes or crannog) the friendliest race in the Bogwood. They distribute pure water to other Bogwood inhabitants for their economy. (Water Oak, long story, explain later...). They have clues to where a hunter dwells and may know more.This is the next location.

Hunter's Swamp Lodge, accessable by watercraft only. The hunter there is found dead, though his hunter's log and a map can aid players to finding location of the Swamp Druid. Problem is that the Hunter is now a ghost, having been recently killed by the Fey and cursed to haunt his lodge and torment visitors.

Maybe one more location, haven't decided what but thinking about including Shambling Mounds. The Bogwood is filled with giant insects, spore emitting fungi, carnivorace plants, crocodiles or something similar, constrictor and venomous snakes, slimes, oozes, perhaps an Otyugh, some new creatures like the Swamp Cat and the Tree Goat.

Final location, the Swamp Druid's Enclave with the adjacent Dark Fey Rath. Big fight with Fey Queen and her entourage. I don't want to have the typical prankster spritelings, but murderous enchanters with enslaved guardians.

Must defeat the fey, break the spell that binds the Swamp Druid to succeed in quest.

I might include a couple optional side quests within the adventure, or as an addendum.

Finally my plan is to create around 25 maps of my hand-drawn style, along with 200+ map objects formatted for use in MapTool free VTT application. And sell it for $5 from my site.

I'm getting a positive response elsewhere on this, but its a challenge!