HELP for triangle structure

Hi everybody, i'm sorry but  i still need your helps. 

Thanks in advance for everybody

I would like to realize a structure under my triangles.

I designed the basilar triangles

but now i have some difficulties to realize the frame around them. i would like to realize something like this one (only the wooden frame) but i really don't know how can do:

someone can help me?

Thanks so much in advance.