the only tips I can give is to mix the fondant with tylose so it will dry harder quickly. Other than that it's like playing with clay...just keep working with it with your fingers till it looks the way the real thing looks...or as close as you can get.
Okay, so science tools eh? You can cover plastic dowels for the bunsen burner but I'm not sure about the base, maybe a small cake board covered in fondant?
As for the beaker, you can try and shape the beaker and use plastic /seran wrap to keep the shape.
I'm currently looking around my lab right now trying to figure out what else you can make haha. Maybe a pair of goggles, some test tubes, (pvc / plastic dowels again). Same idea with the graduateed cylinders.
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