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I picked up one of those 350 scale Trumpeter Liberty ships.  Is there any conversion I would need to make to designate her an AKA?  Anybody see any LCVP's in this scale just in case?
Well I did some research last night digging through the "Victory Edition" of "The Ships and Aircraft of the US Fleet, and I have good news and bad news.   
The good news is that there is no doubt that Liberty ships were designated as AK's which is "Cargo Ship". Additionally they also wound up being used as many other different types of Auxiliaries, to include AKS (General Issue Store Ship), AKN (Net Cargo Ships) which transport and lay anti-submarine nets to protect fleet anchorages, and several different varieties of AR (Repair Ships).
Here's the detail.  The "Liberty Ship" is a specific "Maritime Commission type". To be precise, these ships are EC2-S-C, which according to the tables indicate they are 14,250 tons,  441' 7" length, 56' 11" beam, 27' 7" draft, and a top speed of 11 knots. There are literally dozens of different designs for auxiliaries from the Maritime Commission with all sorts of dimension, weight, speed, function, and appearance differences.
Now for the bad news. No Liberty ships were designated as either AKA (Cargo Ship - Attack) or APA (Transport - Attack). The "Attack" ships operate inshore and "discharge troops (transport) and cargo off beachheads, loading their self-borne small Landing Craft, providing considerable fire-power to cover the operation".
I found one note which said 4 EC2s were designated as "AP's" (Transport) with the difference being that this class unloaded troops well outside of combat areas, but none of the ships listed in that section are EC2 designs, and beside, these are not APA's anyway.
But there is a silver lining!!!   I DID find a picture of a Liberty as an AK and in addition to some Grumman Wildcats on the deck, there were also some Landing Craft as well. I'm not certain, but they appear to be LCMs based on size, rather than an LCVP. 
So if you can find some Landing Craft in 1/350, you can put them on the deck as well as some Wildcats, and you'll be fine, it just shouldn't be called an AKA.
You're going to have to use something else if you want to make an "Attack" Auxiliary.  I've got the old Revell "Montrose" kit in box scale, that I intend to make as the APA 228 instead of the Montrose which was the APA 212.  And the name of the APA 228 (most of which were named for counties) you may ask???
The Rockbridge.
Tom