I think I have a few things that may be useful. I have a Donut Plains tileset with a couple of cool things on it that I could get to you. I also have alot of Mario character sets in SMRPG graphics style. My brother is really good at spriting but we are working on another project in Gamemaker right now, and we've pretty much decided that we're not going to use them for anything. At least not anytime soon. So I can send a few to you and you see if you like them.
Also, when we used RPG Maker Xp, I used the Cybersam CBS as well. However I made some major adjustments to it to suite our needs. It now allows for you to create weapons where the player does not go straight up to the enemy. For example, if you wanted a character to have a bow and arrow, you would change the code a bit for that weapon and the character will only move slightly forward and then shoot. For an example with a little more relevance, take Geno into consideration. For all of his attacks, he stands back and fires from a distance rather than running up to attack like the other characters. I also adjusted the character position and running code to make it isometric like SMRPG. However it is backwards isometric to SMRPG. But I can change that fairly easily. So if you want this version of the script and the battle graphics that I made for it just say so. I may take awhile to send them because I never finished all of them, so I might finish them if you want them. I already have Battle Graphics for Mario and Yoshi with a variety of attacks in SMRPG style. I intended to make Luigi next, but never got to it. So I'll do that as well if you want.
Something else that I have might be of use to you. I made a new CMS that looks just like the one from SMRPG. Sadly it too is not quite finished. I need to remake the item screen to look like SMRPG. But other than that, it's pretty much complete. I also have the "Switch" option integrated into the menu, so there would be no use for an item such as the "Party Poser SP" as I believe it was called. The menu supports up to four active party members and utilizes a large party script (not made by me) that allows for unlimited members, and to have characters that can not be switched (ex. Mario & Luigi).
If you want any of these things for PMP2, I'll be happy to finish and send them to you. This is pretty much all that I can offer though because as I stated above, my brother and I are working on another project, so I will not be able to script, sprite, or map for the project. Contact me if you're interested in anything and best of luck on the game.