First off, we don't judge or flame here. Just a group of great people with a lot of knowledge.
Second, they are all slow builds, we are always changing something.
This trailer looks like a great starting point. First, like the others stated, lose the axle.
Make sure the new axle has brakes. You won't regret. If you use the same bolt pattern, you will only have to carry one spare.
Don't get overwhelmed. Finish each item you start before you move to the next.
Ask as many questions here as you can. There are no stupid questions.
LEARN FROM OUR MISTAKES! Not that I ever make any, just sayin.
Jeff