heres some pics of my fort (which was built with out noclip) it incoperates the 'gate house' (as i call it) in this post (with a few addaptions to make it easer to use and stronger )
http://www.sourcefortsmod.com/forums/viewtopic.php?t=93
1.The outside

(yes i was very board when i made this)
2. From the front wall at the bottem

(notice the double walls to stop/hold back people with deharmonic thingys)
3.The gate gaurd

(stop you from getting shot whilst you wait for some one to open the gate bit)
4. Gate house

(mostly the same as the original but two major differences which are listed in 5 and 6)
5. Entrance (same as origenal but more planks on the bottem to stop DD)
6. Gate house ramps (for easyer access to opening it)
7. The ramp to the keep

(with handy nade proof roof)
8. View from the keep wall
9. Post on-top of the ramps

(probable the best sniping place)
10. Inside the outer keep

(alot of the ramps arnt needed but there useful)
11. View from inner keep door

(highest point with out climing on the walls. I was planning on making it 10 bricks high but i gave up at 5 and added 2 layes more for looks)
12. Inside the inner keep

(hardest bit as due to a slight error on my part the ramp bits barely fit into the walls the walls)
so, yer, thats it tell me what you think (i was really board)