I am building a SE also and and have built a 4* 40 as well and as that are all most the same. some thing's i learnd form my 4*
I may suggest a doubler to reinforce the top 1/4 stringer from the head rest
to the tail. put a reinforceing piece ascross the rear of the landing gear block,i use 4 10x24 nylon bolt's on the landing gear 3 across the front and one to the rear.
and a 12oz soft sided tank.it fit's real nice. it just stick's threw the rear former a bit further.i think it was a Sullivan.
happy flying
Rich