We have a 14 Seneca the inside is pretty much the same, have seen a 15, pretty much the only differences are some color and decorative changes. You do loose some size in the overhead bunk with the entertainment center. It is about half as wide, can only sleep one. The Jack Knife Sofa sits from wall to cabinet 5'1", could sleep one. The safe on the other side opens up to a full size bed, could sleep two. The both dinner is 5'4" from cushion to cushion. Table top has no leg at front edge to get in the way when sitting, lowers with an air shock type system and sits on wooden edges along both seats. Don't have a picture of the underside but can get you one if you need it.
2014 Jayco Seneca 37TS