Custom made Ally dingy to fit on to No5 trailer?

[3 Sisters]

Not sure if this is the right section.
But can anyone tell me where to get an aluminum dingy made to fit on top of my No5 trailer and act as a lockable top to it, so I can fit Mountain bikes and other gear in there.
I'd be happy with just an angled flat front, so it's aero dynamic, and if it had to over hang to make the dingy more practical, I could just have a wall across the inside of the dingy to make it the same size as the No5.
I'd just get it flat bottomed, and probably 2-3foot deep.
Anybody have any ideas to ad to this for me?
and/or
Where to get one made?
I'm near Sydney(Blue MTNs).

[3 Sisters]

Already started another thread on this here http://www.aulro.com/afvb/shopping-trolley/86452-custom-made-ally-dingy-fit-no5-trailer.html#post1051455
Wasn't sure where to post it.

[slug_burner]

Tinies are usually pressed sheet with a few spot welds. Custom manufacturing is not really suited to that method of manufacture. The custom aluminium boats are usualy plate boat starting at about 4mm. Any plate boat manufacturer should be able to knock one up, it might be a bit heavier than your normal run of the mill tinie.