ADVICE: Foamie -Modular for multiple setups & takedowns????

I was reading all over the forum and not sure if anything fits what I want to do and I will happily move/delete this if it is in the wrong place or just not for this site.
I want to make something that I can bring with me but NOT on a trailer (I already have a TTT) that I can setup on the ground when camping and provides a room that I can stand up in and do stuff in (cook, eat, lounge, get out of the weather, etc...) when I'm not sleeping in my TTT. My TTT is an old build thread on here somewhere and is an old pop-up's trailer-only with a truck-bed-camp cap that I built a wooden truck bed to mate it to the trailer. You can't stand up in it and it is not a place to be unless you are sleeping.
I love the idea of a foamy build for it's ease (perceived) and good on the wallet and it is to make my camping experience more comfy and convenient without buying a true camper trailer. I also don't want to get rid of my frankencamper since I just finally finished it last year and haven't been able to use it too often yet.
MY THOUGHTS. Make 2-3' by 8 foot sections that become the walls and a simple A-frame style roof; more what I can store on top of or inside the TTT, or top of TV (2011 Nissan Pathfinder). Then within 15mins or so I can erect it.
????How to use temporary fastening to lock together walls at corners, roof to walls, and wall sections that will need to be 2-3 pieces vertically "stacked" to make a height I can stand up inside of (I'm 6'2" tall).
I'd do a door and windows at the end (unless you need to do something with wood for attachment points that I'd design earlier on.
I will post a current pic of the TTT as soon as I remember how on here again.
I would then need to take it down and pack it away each time so it can't be permanently put together and I want it to not leak. I'll figure out how to make the ground/floor just to keep water and such out
THANK YOU in advance for ANY help/guidance!
_John
I want to make something that I can bring with me but NOT on a trailer (I already have a TTT) that I can setup on the ground when camping and provides a room that I can stand up in and do stuff in (cook, eat, lounge, get out of the weather, etc...) when I'm not sleeping in my TTT. My TTT is an old build thread on here somewhere and is an old pop-up's trailer-only with a truck-bed-camp cap that I built a wooden truck bed to mate it to the trailer. You can't stand up in it and it is not a place to be unless you are sleeping.
I love the idea of a foamy build for it's ease (perceived) and good on the wallet and it is to make my camping experience more comfy and convenient without buying a true camper trailer. I also don't want to get rid of my frankencamper since I just finally finished it last year and haven't been able to use it too often yet.
MY THOUGHTS. Make 2-3' by 8 foot sections that become the walls and a simple A-frame style roof; more what I can store on top of or inside the TTT, or top of TV (2011 Nissan Pathfinder). Then within 15mins or so I can erect it.
????How to use temporary fastening to lock together walls at corners, roof to walls, and wall sections that will need to be 2-3 pieces vertically "stacked" to make a height I can stand up inside of (I'm 6'2" tall).
I'd do a door and windows at the end (unless you need to do something with wood for attachment points that I'd design earlier on.
I will post a current pic of the TTT as soon as I remember how on here again.
I would then need to take it down and pack it away each time so it can't be permanently put together and I want it to not leak. I'll figure out how to make the ground/floor just to keep water and such out
THANK YOU in advance for ANY help/guidance!

_John