Yes, very, easy ditch it and build one out of wood.
Styroform isn't made for high temperatures and a solawaxmelter reaches up to 200?C, where the box will allready melt.
If you allready habe was srapings, go the easy way. Get a nice gas stove and a 10 gallon pot. Add 1 gallon water and fill with the wax scrapings. Turn in the heat and add wax untin you have only 2" until the rim. Then usw a strainer to take out all the cocoons and let the wax cool. Pressure wash the dirt of the bottom, remelt/rewasch 2 times Aland you get besteht wax for storage.
A better way is instead of straining out the cocoons, to build a plate out of hole Metall, that exactly fits your pot and push it down to the bottom of the pot. This way all cocoons are in the ground and lose more wax, since lot of the wax will float up.