Construction of Tear Drops

I am a very new member of this forum - like just registered. I was directed to the forum from another forum "RC Groups" for model aircraft. Your Tear Drop trailers are just superb and look just the job for me and my models to tour to certain events. I will start construction as soon as I redesign the interior to accept the planes.
I do have a question regarding construction of the trailers. The free instructions on the Benroy Plans (and I presume on other Tear Drop designs) uses insulation in the roof and floor but uses 3/4 ply for the sides. Would it be better/lighter to use a similar construction for the sides as is used for the roof? In other words use a 1x2 sheeted either side with the 1/8 plywood with foam insulation inbetween?
Forgive me if this has been discussed before.
Mark.
I do have a question regarding construction of the trailers. The free instructions on the Benroy Plans (and I presume on other Tear Drop designs) uses insulation in the roof and floor but uses 3/4 ply for the sides. Would it be better/lighter to use a similar construction for the sides as is used for the roof? In other words use a 1x2 sheeted either side with the 1/8 plywood with foam insulation inbetween?
Forgive me if this has been discussed before.
Mark.