Because the LE top sheeting needs to be bent down, I decided to avoid using pins. Instead I will use long bass square sticks and a yardstick at the spar. These will be weighted with my trusty bean (well actually river gravel) bags.
Bass sticks are the right length
Combination of bean/gravel bags and obsolete transmitter battery packs.
Well, I did decide to go with my old Rocket City pin clamps at the
trailing edge and the very forward edge of the LE top sheeting.