The big scale stuff is, I suspect for use with "action figures"...
Ummm, no. 1/18th is a very popular 'die-cast collector' scale that has nothing to do with 'action
figures'.
Aircraft subject prebuilts and kits have been marketed before in 1/18th, 21st Century Toys had
a fairly extensive range before they imploded, Pegasus sell a V-1 and a Bell X-1 in 1/18th.
IIRC some of these 'new' Merit 1/18th listings have been announced before under different
Chinese branding but remained vapourware.