Well as one who obviously has to much time on their hand I went and figured out how many tiles/furniture you'd actually need for this, without recycling stuff from prior parts of the board.
4 Heroquest Gameboards (Which I'm surprised to say I can almost manage, having a UK, US and Advanced version).
51 Single Rubble/Block Tiles
10 Double Rubble/Block Tiles
17 Secret Door Tiles
13 Pit Tiles
3 Alchemist's Benches
10 Bookcases
3 Cupboards
3 Fireplaces
4 Racks
4 Sorcerer's Tables
12 Tables
5 Thrones
2 Tombs
14 Treasure Chests
3 Weapon Racks
Now if you had manage to get a hold of 4 sets of Heroquest the above furniture and tiles isn't to undoable, you'd need to get yourself some extra bookcases, tables a throne and some more chests, but the real killer is.
114 to 130 Doors*.
Even with those four sets, you'd have about 64 Open Doors and 20 Closed Doors.
*Depending if you wanted to have a door sat on the board edge between two boards, or try and do the little mini-passages shown on the quest map, in which case you may also want 16 short passage tiles to connect each board section.
Although less necessary as Monsters typically don't stay on the board for that long (unless the players are doing a weird passive sightseeing tour of Dark Company's map) here is a complete list of monsters too.
26 Goblins
55 Orcs
21 Fimir
6 Zombies (1 being Vadim Gorfell)
6 Mummies
3 Gargoyles
49 Men-at-Arms 'Dark Warriors'
19 Chaos Warriors 'Doom Guard' (1 being Hinsgrim)
1 Chaos Sorcerer (Delzarron)
Surprisingly not, one, single, Skeleton :/
Well I'm not sure this is useful to anyone (who would be crazy enough to try and run it like this
