Hi razzer,
Posting hints [from experience]: I usually write up my posts in
Wordpad/Word first, then save it, then copy and paste it to the forum's
posting box. That way you can have a copy of it elsewhere [if you want
to keep it - or not, if so, then delete it there after you post it] and it won't
get lost in the process [Usually ! Ha !] [Or Ctrl A, then Ctrl C, to save
on the computer's clipboard, what you've written before you try to post,
so that, if you have timed out of the forum while you were composing your
post, all you need to do is to go to the empty posting box you'll then get,
if that happens, and then Ctrl V to paste back your post into it. Both
method's will work to save it for you, but the first is more error-proof.
Here is a possible design to use/look at/modify if it appeals to you any.
It's a fast Paint drawing I did of a folding bicycle TD/TTT, in the folded-up
position. For travel, the side and end panels, shown in the center, would
be folded down inside over the mattress, in easy motions as they are always
connected by hinging, and the top would then seal against the storage bottom
for travel with a perimeter seal and lockable cinch-down clasps.
Click on the pic to enlarge:

The gist of it is in text in the pic. If you want any more details feel
free to ask. Since you built/made such a fine AL little cargo trailer
there already, I'm sure you can see what the abbreviated description
implies.
My idea, here, is to have some accessable anytime storage under the
mattress platform [lockable drawers would be very useful for that]
and a low towing profile height. I'd use 20inch wheels for it to help
keep it low and well under the bike's seat height. Since your body is
already disturbing the air in that zone by the action of pedaling, I don't
think there'd be excessive drag from it. The folded height of the body
would be @ 18inches plus ground clearance. The folded-up inside height
would be @ 36inches. Depending on your needs/requirements,
you can adjust interior and exterior dimensions to suit/fit.
Here are links about an emergency shelter that uses aluminum foam skinned
panels - similar to what I've described - as an example:
http://www.smartplanet.com/blog/global- ... elief/9680Click on the left pic to enlarge:
http://www.modularflex.com.ar/productos.htmlHere's a link to a great Danish website that uses aluminum square-tube's
to frame DIY recumbent bikes and trailer:
http://www.n55.dk/MANUALS/SPACEFRAMEVEH ... icles.html[While you're at it, check out their whole website, as it is quite interesting:
http://www.n55.dk/MANUALS/Manuals.html ]
'Hope this is helpful...
Cheers,
Norm/mezmo
If you have a house - you have a hobby.