The general idea here is to have smooth, flat, ding-free surfaces over which to lay your fiberglass cloth. As far as fiberglass cloth goes, my basic guide to what weight to use is directly related to airplane s
[15] The new spar structure also allowed the wings to carry up to 2,000 lb (907 kg) of external stores. Also developed specifically for the Tempest by Hawker was a streamlined 45 gal (205 l) "drop tank" and carrier fairing; the redesigned wing incorporated the plumbing for these tanks...