Yes, a set of forms is usually good enough to make several boats, however, the plans are sold with the understanding that you will make only one . If you wish to build more boats of the same design, I ask for a small royalty on each additional boat you build. Please call of write for additional information. No, you can use strips that are shorter than the finished boat. You can either scarf shorter strips together or you can simply butt-join them.
Shorter strips are generally cheaper and easier to come by.
The list price of the kits generally assumes short strips. This is hard to predict, it depends on you. It takes me about three months of weekends and evenings. I would guess about 150 to 300 hours. The kit will probably save about 50 hours.