New here - why doesn't everyone foam?

Ok, up until about an hour ago, I had no idea what I foamie was....I thought it was a new Starbucks drink but I see it's part of the teardrop trailer options that have me so excited!
So a few questions...I've searched nearly every thread but didn't see this....so....
Why doesn't everyone make a foamie? Can you not have a galley in a foamie? They seem easier to build (or maybe that's just my imagination?) then a standard wooden TD....certainly less expensive - I think?
Has anyone taken all the wonderful ideas and put them into one step by step, how-to manual on building a foamie?
So a few questions...I've searched nearly every thread but didn't see this....so....
Why doesn't everyone make a foamie? Can you not have a galley in a foamie? They seem easier to build (or maybe that's just my imagination?) then a standard wooden TD....certainly less expensive - I think?
Has anyone taken all the wonderful ideas and put them into one step by step, how-to manual on building a foamie?