Shipbucket

For another interest of mine (reenactment) I am looking for information about ships of the celts. There is not much information about them while most reports are from someone Gaius Julius (yes, the later called cesar) and someone else I don't remember by now.
From these reports I can extract, that the celt buildt their ships very massive. This is from one report that tells from an encounter at the channel. The romans rammed the celtic ship (we all know those roman ram bows, I believe) and the celts didn't take much damage. Another detail is the sail. It is said, it was from sewed leather and from any woven stuff. We know, the celts used iron nails, the even had invented the screw. Bending wood with steam was unknown to them.
The celts have sailed the Mediterranean Sea and the North Sea and so on. The where great dealers and even silk (!) was found at archeological sites. How did their ships look, before they met the romans?
This is an example of a roman influenced ship found in the mud of the Themse:

I am looking for something that is much earlier.
So does anybody know something about celtic shipbuilding. Maybe by books, by links, anything. I am thankful for any advice, even if I get the same the tenth time.

And yes, I know how to google...

edit: a shipbucket design I did some time ago

The boxy design of the ship results from its from half-timber houses derived technique.

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Does really no one know anything about the celts and their ships?

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The most I know of is the Currach, which i think is a type of vessel made of skins stretched over a frame. http://en.wikipedia.org/wiki/Currach I didn't post this earlier, because I figured you already knew about it.

A brief bit of research turned up this: http://www.reference.com/browse/currach Again, You've likely found it already.

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Thanks, but it's not the curragh I'm looking for. My research goes for a very massive ship, offshore-able, of a very archaic design. No bent planks, more boxy. The celts invented the technique to bend planks with steam very lately.

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This is a serious forum. Do not laugh. Do not post nonsens. Do not be kiddish. At least, not all the time.
Current work list:
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