I love the 24.1 layout but I did not like the trifold sofa that came with the unit. All the floor space was gone if it was deployed. I spend awhile searching for a 68" jackknife sofa and found one at IKEA for $139 that fit. (
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I figured at this price I should at least try. I removed the old sofa. Not too hard, only 4 bolts in the floor.
I built a box frame 67" x 29" x 13" out of 2x2 with some metal reinforcements. I put in cross braces where the sofa could attach. I added a sliding drawer and some sliding doors to finish it. The sofa can lay flat with the large table still in the storage position AND I just gained a huge amount of storage under the sofa! The sofa is comfortable sitting and laying down. The wood frame cost more than the sleeper sofa!
BTW I have a used 68" sleeper trifold sofa for sale.