YES, YOU CAN SCALE ALL BODIES DIRECTLY IN SLICER. !
What do you need? calculation formula!
FOR INCREASE:
Example. You need 313mm wheelbase.
100/267x 313 = 117,22% - well you need to increase all parts in 17,22%
100 - this is 100% dimension of actual body what you have
267 - its your actual wheelbase. (242, 252, 267, 280, 300 etc)
313 - this is example of wheelbase what do you need.
FOR RIDUCE:
Example: you need 360mm wheelbase.
100/360 * 10 = 2,77% (for reduce all parts in slicer)
100 - this is 100% dimension of actual body what you have
360 - its wheelbase what do you need (242, 252, 267, 280, 300 etc)
10 - this is difference of wheelbase from original model and wheelbase what do you need. (313-300=13mm, 300-267=33mm, etc)