The West Coastway route is a great route! Class 377 and 313 run down it a lot. I thik this will be a nice addition to TSW2. I'd be happy with a standalone DLC or an Add-on to the East Coast Way. Services from Bognor Regis to Littlehampton can easily happen. At Barnham, you can take over Southern services to Brighton from Portsmouth Harbour or Southampton Central. Littlehampton to London Victoria services can be taken as far as Hove.
I’ve been looking at this myself, and think it would be an excellent addition. Plenty of service opportunities: Brighton/London Vic (from above) -Littlehampton/Bognor Barnham-Bognor shuttle Bognor-Littlehampton shuttle Brighton-Hove shuttle Brighton to West Worthing stopper. Plenty of service opportunities with the 313 and 377!
I would really enjoy this too I actually made a suggestion thread as well a while ago and it goes through my local station so I would really enjoy that