.
The checksum doesn't matter in most cases. Most tools causes to turn the checksum bad and LM autocmatically fixes it anyway.
Now, I think you have used GPS properly and you should test by inserting a block to see that it really worked.
Here is a patch which allows to insert custom bounce blocks. I linked it there for two reasons:
- The one in the blocks section is a pretty good replica of the block as much as SMW's limitation allows it: It just spawns the bounce block without temporary disappearing the block. The bounce block patch allows to bypass it.
- More over, the example block is a brick block which can be spin jumped. It requires the patch but because you replace the turn block anyway, I will later show you what you need to change if you don't mind to apply the patch.
Be aware that GPS doesn't allow to insert custom blocks on the first two pages. There is a workaround: Insert it like usual and then change the acts like setting of the turn block to the custom block.