Inter Island Freighter

Something like this?

http://www.modelshipgallery.com/gallery/service/cargo/putumayo-700-rk/rk-index.html

Here's a few more....?

http://images.google.com/imgres?imgurl=http://www.tin-soldier.com/paper/smfreighter5.jpg&imgrefurl=http://www.tin-soldier.com/paper/freightersm.htm&h=430&w=415&sz=157&tbnid=QXwcgXheOCcchM:&tbnh=126&tbnw=122&prev=/images%3Fq%3Dtramp%2Bsteamer%26um%3D1&start=1&sa=X&oi=images&ct=image&cd=1

http://images.google.com/imgres?imgurl=http://www.craftsmanshipmuseum.com/images/MattPacStar1.JPG&imgrefurl=http://www.craftsmanshipmuseum.com/Mattson.htm&h=383&w=722&sz=81&tbnid=MNzRFvSgbXJ5GM:&tbnh=74&tbnw=140&prev=/images%3Fq%3Dtramp%2Bsteamer%26um%3D1&start=3&sa=X&oi=images&ct=image&cd=3

Loose Cannon Productions has a number of civilian ship kits, including two that could pass as tramp or interisland steamers, and one modern small container ship: http://home.earthlink.net/~loosecannonproductions/index-civ.html

I've built several of their kits. They are all well molded and generally include a PE fret so there's nothing else to buy.

 Perhaps, something like this, kitbashed from a Lindberg North Atlantic Fishing Trawler:

Seeing these models instantly reminded me of one day in 2005 that I spent sitting on a bank, high, maybe 200 feet above sea level, at the entrance of Hong Kong Harbor. I was amazed at the sight of a steady stream of cargo ships or all sizes and registrations that were coming and going from the harbor. It is quite a sight.

Peewee

Deans makes a whole bunch of merchant ships...

http://deansmarine.co.uk/shop/index.php/cPath/10_20

A 10 minute walk from my Hotel in Malaysia

I think you could re-work the Revell Glasgow tanker into a generic "three island freighter".  Add some hatches, lifting tackle, change the stack and you could be most of the way there.  Here's an HO kit available:

http://www.internettrains.com/merchant2/merchant.mvc?Screen=PROD&Store_Code=IT&Product_Code=SSM-HO-1082&Category_Code=

Andrew