Actually the price is quite reasonable, compared with other tent trailers on this board. Top end ones run into the low to mid 20's. It has a steel frame, upper it sounds like. The honey comb panels are quite expensive and is the RV industry top standard. I have seen tents like that go for close to 5K.
In honesty if I were looking for a tent trailer I would certainly consider these. Have no idea of the quality, but a lot of thought has went into this trailer it seems. May just take a look at one. I know I would like to have that tent for the top of my tear drop if it was flat. But mileage is more important.
What are the concerns about the steel tubing and axle. I did not see anything about them.