Oh, EmmaZ, if only you could squeeze a four foot wide teardrop trailer through your three foot wide apartment door, you would be home free.
Fat chance for that ever happening. My suggestion would be to somehow find an appropiate space to build your dream teardrop, such as: perhaps a rental garage, a friends back yard, a corner of an industrial building, a workshop that is is unused for a short time, a triple garage, that has extra space that is unused, or mayby a highschool woodshop, that would go along with having a fine looking female woodworker, giving pointers to young studs, contimplating the construction of a teardrop of their own.
Looking back, 50 years ago, I would have loved to have a gal come into our highschool workshop and let us interact with her efforts to construct a one-of-a-kind teardrop trailer, from start to finish.
However, if none of these options are viable, come on out to So Calif, and I will provide the needed space for you to to complete your build. All you have to do is convince the sweet wife that my intentions are honorable and, after all, after 56 years, what else would they be? Good luck on your build, and don't let your dream fade, no matter what the reason. Building and using a teardrop trailer will change your life, I promise.
Roly, just an old retiree, trying to be helpful to a damsal in distress.
