In the design phase

Hello, I just received a trailer as a Christmas present. The trailer is the harbor freight 4x8. I have some basic questions to hopefully steer me in the right direction. I want to make a useful camper, but cost is a big consideration at the moment. At the same time I don't want to outgrow my camper's usefulness quickly.
I am thinking of making a somewhat boxy design with a rear entry door. Will the lack of a galley wall negatively affect my structural integrity?
I will be mostly camping in Florida, and will use the fantastic fan and have 2-3 windows. If I do not insulate my walls or roof, I have read that condensation at night is an issue, how big of an issue would that be for me?
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I am thinking of making a somewhat boxy design with a rear entry door. Will the lack of a galley wall negatively affect my structural integrity?
I will be mostly camping in Florida, and will use the fantastic fan and have 2-3 windows. If I do not insulate my walls or roof, I have read that condensation at night is an issue, how big of an issue would that be for me?
Sent from my iPhone using Tapatalk