I updated the blockbuilder to work with the models OP have shared and I also added a small altering of a plugin asherkin made for me. This external plugin gives temp accessflag "o" (which is used to build with the blockmaker). You can use this to give a player temp access to build blocks but he will not be able to use the save function and he will not be able to use the "delete all" function.
Update: Use
this tool if you can't compile the files.