We have the 6503 with the front dinette being similar to the 6501. I changed a lot of the construction and as same with you the seats fell through the staples did not hold much. I replaced the framing with cypress and covered with 1/4 Baltic birch on the sides and 3/8 on top for the seats. The 1/8" plywood was not very strong and with the framing with soft white wood cracked and split with knots falling out it did not have enough strength to support 50 lbs. The table and kitchen counter tops I replaced with 3/4 " Baltic birch. Our table is supported on the front wall similar to yours with on folding leg supporting the other end. We paid 10,000 new for our camper so the time and money was worth it and it included the stronger 4,400 lb. axle with 15" wheels. We have spent about $1,000 and 80 hours fixing it up but has turned out much better from the way be bought it, we are very happy with it. Love the large storage compartment.