Front axle under the 1:1 Critter was a straight tube axle, kit has what looks like a narrowed Model A unit. Not sure about the rear suspension but much of the kit design appears to be cribbed from the earlier Willys kit. A lot of 1:1 gassers did have quarter elliptic rear springs like that however.
Frame is way too narrow, the side rails form a portion of the door sill on those cars so should be nearer to the body than they are. (Fabricated frames were not allowed by NHRA until 1967.) Transmission tunnel looks like HVAC ducting, way too big inside that tiny car. Even the wheels are wrong for the Critter, no effort was made to alter the box art photo unlike the later '57 Nomad kit.
Then there's the engine. NHRA rule books from the era state that these cars can compete in Gas classes because they are a better fit there than in Modified Sports classes. (Wheelbase was 90" or so, under the then minimum 92".) Engines were restricted per the rules to "Chevrolet 265/283/301 or equivalent, unsupercharged, with larger blocks not allowed". This would exclude Olds, Buick, Pontiac, Cadillac, Ford FE, Chrysler B, 426 Hemi, or 392 Hemi, among others. Not sure when the restriction was lifted, probably 1967 when a bunch of other things changed. The only Olds engine allowable prior to that would be the aluminum V8, which nobody raced due to lack of aftermarket support.
George Montgomery's "Gasser Passer" Prefect did meet the wheelbase minimum, but ran in Altered class with a supercharged small-block Chevy, possibly the one swapped out of his Willys when he got the Ford Cammer engine.
My thinking is that the kit was designed first, and permission obtained to use the Critter name and markings later. The Thames was simply a second version, with body dimensions taken from a stock one. Per Thomas Graham's Revell book, a stock Thames was found on a neighborhood side street parked in front of a residence.
On the plus side, bodies in both kits are very well done and make them worth getting in spite of everything else being so incorrect. I was kind of surprised that Revell didn't follow up their new '41 Willys kits with new Anglias done in similar style, though.
--Mark