I have built several for myself and others used quadra 42 ,homelite 25cc, g62(72"), currently flying one zdz40 wtih a 76"wing to fit my shortbox chev truck.

all were hard mounted with no problems

move firewall back 2" but leave sides full length. You then can use a spacer to move the engine forward if needed to adjust cg and get muffler clearance

add a doubler from rear of firewall to rear of wing saddle. This means narrowing f2 to fit.The fuse failures I have seen have all been at f2 where the fuse is notched out .

16 oz tank will get you 10 min safe but I would go with a 20oz

glassing the abs. I did the cowl and wing cover with .6oz cloth and thin CA the rest I just glued on.

go with the 80"wing with the gasser you can set your hinges and cap strips so you can trim it later if you like

any questions email me

Randy