Hi Dave,
Thank you for your kind comments. I recently discovered your own build and it has inspired me to do a bit more with the Tigin. So here’s where I am now.
My preference for skinning the teardrop was anodised aluminium but I could not get it in Ireland in less that 3mm thick (too heavy) and the sheet sizes did not work out so after a lot of thinking I decided to us FRP sheeting (Fibreglass reinforced plastic).
It’s about 1 mm thick and very light. It has a translucent appearance and is commonly used here for the roofs of horse boxes. Miraculously, the sheet comes in a size that was perfect when it was cut down the middle.
Firstly I used automotive fillers to get the sides as smoth as possibe then I hacked up the FRP with my circular saw to sheets that were of a manageable size. Here is the first one clamped up to one of the sides:

After some more clamping and fooling around I managed to get a rough cut on the profile leaving the sheet about 1/4 too big:

Then came the fun part with contact glue. I did this by again clamping the sheet across the top of the trailer and gluing the bottom half first. This actually worked out well. Because the sheet could not move with the clamps. I let that set for a day. Then I undid the clamps at the top, dropped the sheet back to where it as glued the night before and painted glue to top half. I smoothed this on and let it set for a couple of days. Yesterday I them sanded back the edges to the profile and cut the door panels out with a jig saw and sanded them back. Here is how she looks now.


Here are a couple of detailed profile shots:


The contact glue worked a treat as far as adhesion but because FRP is transulent you can see the swirls of the glue through it which gives a kind of marbled effect - not very appealing. It does however, take car paint, so this is the colur pallet I'll be going for. A flat grey or maybe a metallic grey with black mud guards.

I've decided on how to insulate the roof void. This will be spayed in professionally with closed cell expanding foam. I decided on this option so as to increase the trailers structural stability - there is glue in this stuff, it is waterproof and deadens sound too (worth doing if you live in a country like Ireland where it rains so much

!
After that I guess I'll be skinning the roof and making the hatch and doors ......
I'll post some photographs of all that when that happens.
Happy Teardropping to yaw'l
Larry