If I worked in a woodshop, I'd probably try something like this, but...
My personal opinion... and I know it won't be popular because "3d dungeons" are so popular here... is that it's not worth it. Sure, 3D dungeons are objectively "cool," whether they are made of resin, actual stone, plastic, or that balsa wood looking material they're using in those pics.
BUT... Hero Quest is designed to be much more versatile. Look at the board.. there's no architecture, other than the suggestion of some walls that need to be able to move. Sure, having a full 3d set with removable parts may serve your purpose, but for me... if all you want is a "modular" version of the Hero Quest board, maybe with larger squares, there is a very easy and cheap way to do it...
Print out the HQ board (high quality scans are easy enough to find if you don't want to do it yourself), and print out the sections in color (laser printer for best quality). Get yourself some glue-sticks and stick them to chipboard. Once dry, cut out the pieces. You can lay them end to end or make them interlocking if you want. You can play with the size and the quantity of pieces all you want. Modular HQ dungeons accomplished! And while you may lose a piece under the coach on occasion (or the dog chews it up), well just print another one! When you're done playing you can toss all the pieces into a box like a jigsaw puzzle and store it away easily for next time. Big heavy dungeon sculptures like this take up a lot more room, I guess if you are willing to dedicate a permanent space to it, more power to you.
A 3D dungeon just looks awesome. It will impress people who come to visit you, and you can take awesome pics of it to share online which will impress people. But for actual gameplay, in the spirit and style of Hero Quest? No. If you're just looking for something HQ to spend your money on, I can think of all kinds of better uses (minis, paints, dice, books, etc).
If you want something pretty like they are selling though, its your money, you decide.
