Hi Jon,
The LCA is a dog to build but the Italeri kits very neat.
On figures what can I say there aren’t that many around.
U Models have 4
http://www.u-models.com/
I’ve used 2 the captain whos legs I filled out a bit and added sea boots to and the chap with the pole who is very good.
Pete from Jakeri Minitures has a relaxed sailor with a duffel. He is available through Ian at Friendship Models.
http://www.friendshipmodels.com/
Keep you eye on Jakeri as there is an interesting development in the pipe line.
Warriors haev a SAS figure with a duffel who converts easily to a seaman.
For heads see Hornets as they are the only sailor heads around.
If you have any beach landing parties then they can be in DB with sailors cap.
For the rest I choose bodies that will convert easily. I’m not a great sculpter in fact very poor, Use Milliput or Magic Sculpt to extend trousers and make wooly jumpers and duffels as you need.
On the USN side things are a bit better. Trumpter have the LCM Crew and Warriors also have a couple of LCM Figures. Verlinden do a beach landing party althouh one of them is so tall I cut part out of his legs lol, lol. You might be able to use some of the Warrriors DUKW/LVT crews and there might well be some crew coming out for the ELCO Boat, in fact I think there are a couple of figures from Warriors already.
U Models also have USN Sailors which don’t look too bad at all.
Mike at Netmerchants should have the Trumpter and Warrior/Verlinden Figures if you can stand the new page layout.
http://www.netmerchants.co.uk/section.php/356/1/135scaleamericanusmilitaryfigures
Here’s an excellent reference for the LCs if you haven’t already found it:
Skill in the Surf
http://www.ibiblio.org/hyperwar/USN/ref/SurfSkill/index.html
Hope that helps
Al