UT2k4 Onslaught was fappin awesome and would suit MWLL very well bc it was indeed very large scale. Honestly any TC map would make a good ONS map.TL;DR entire thread:
Onslaught was an excellent control point game type for UT2k4 that is large scale enough to be easily emulated for MWLL.
If you are familiar with The Unreal Tournament you should be surprised that Onslaught was an exclusive combined arms game of UT, with ground vehicles from scout jeeps to tanks, as well as hover and flight craft!
The control point system is unlike the basic system MWLL and other battlefield knockoffs use because instead of a map full of contestable bases, only bases in contact to (next to) each other can be captured. Basically the control points have to be linked to your main base or stronghold.
The objective is to establish a link to your enemy's stronghold to destroy it. With enough control points on the map multiple routes between the two strongholds are possible, so the game doesn't have to be locked on a fight over one base.
The game uses a ticket system that is really just the health points of your stronghold's power core and is controlled by several factors. Like MWLL, the ticket drain is affected by how many bases you hold. Turtling your stronghold will result in your team's loss, so pushing the enemy back is vital.
Destruction of assets could keep the ticket penalty from MWLL, but possibly changed to the buying of assets, so it doesnt matter if it's sold or destroyed.
This would also benefit infantry players which is important, because BA have a more significant role in base warfare...
The control points in onslaught are unique from other base capture modes because instead of capturing bases you are destroying power relays and rebuilding your own.
The MWLL equivalent of UT Onslaught is a BA using his laser to construct and repair the base's power generator. In UT you take a laser weapon and fire a stream onto the power node which charges it up until it is full and the base is captured.
The weapons of MWLL dont work like that, so it would be simpler to emulate games like BF2142, where infantry capture the base by standing in a specific area in the base.
When you attack an enemy base, you destroy their power node to make it an unpowered neutral base. Once the base is secure the power node needs to be reconstructed, which can be done by a single BA just standing in/on the power node room/platform or more for speed.
This capture system is itself a challenge because BA will be vulnerable to build/repair the power node. This makes me think LongTom spam will be a problem, so perhaps most bases will have roofs.
Also here's another damn description if you need help falling asleep.http://forums.epicgames.com/threads/308901-Descriptions-of-UT2004-s-Assault-and-Onslaught-Game-Types
Alright all this typing completely exhausted my alcohol so I need to refuel ...