Self-explanatory from the topic, but here's some background:

I'm running a 4E D&D campaign (1st time DMing), and my characters are getting close to paragon tier (Side thought: If your name is Grant and you run a character named Ghesh in a D&D 4E campaign, you should stop reading immediately).

My plan for character levels 11-20 is to make them lords/ladies over various local lands and organizations they've saved a few times, and gradually expand into becoming rulers of their own kingdoms/mage guilds/clergy.

A key perk of their becoming nobility will be the ability to design their own stronghold or castle. Once they're well established, I'm hoping to run a few battles where one or more of their strongholds comes under attack. The ruler who is defending their home will play as their character, the others will temporarily play as the captain of the guard, head mage, or other important figures during the siege.

Looking ahead, I would love to build their strongholds with TLX tiles, so I have 2 questions:
1) Will there be a castleworks equivalent for the TLX system in the semi-near future?
2) Will 1" or 2" wide walls be possible? I'd like for them to be able to design their walls and towers of varying widths and heights. I can deal with forcing them to build towers and buildings in dimensions that are multiples of 3, but I'd balk at forcing them to have 15' or 30' thick walls.

Thanks for the awesome system!

I think it's pretty safe to say that you'll see a CastleWorks-like equivalent under TerrainlinX in the not so distant future. I haven't puzzled out all the bits that I'm including yet but I can say that it will be wholly a unique product unto itself. The big thing I'll be looking at is flexibility. You'll be able to create some truly diverse fortifications with this one.

Most excellent. Thanks for the information and the incredible sets, Denny.