As I already said the question was about sheets not kits.
An alternative to foam sheets and probably obtainable locally would be wide foam strips as offered as adhesive tape.
Mouse pad foam, scissors, craft knife, straight edges, and double sided pressure sensitive tape are things in my den anyway.
Sometimes rubber cement - from bike inner tube repair saddle pack.
Nail lacquer remover - stolen from girl.
Used chop stick from last Ch meal.