Before you go to Candypalooza,go to the island that has unicorns and things, if you beat that place first, the dj booth and speakers, are easier because you will be given a formula for a solar panel. E
To get a large petit house, first go to your island then geet a large base block and customize it(don't worry you can still change it)then get a petit base block and put a door on it, go in it and it's the same interior as the large base block, now you can take away the large base block and you still have the interior in the petit block. Please rate this is my first hint.
First, got to the King's Castle. There will be chairs lined up along the wall to the right. Jump on one of them till you reach the top of one. Finally, jump twice more and you should be on top of the wall. You could also use the drawer.