Maybe consider a pre-made acrylic baffle kit, like the ones from Marine Biosystems on eBay. I think they have the best bang for your buck for these kind of kits, even better than Fiji Cube or Jax Racks, which are also popular choices. You can reach out to Marine Biosystems if you have questions or need customization. By doing this yourself, you'll be well prepared to make a change to the system down the road, if that's even necessary.
Here's an example for a 20 long, but I'm sure he can make something that would fit a 25 if you have the tank already:
https://www.ebay.com/itm/275676397759?var=577053700520
One way reefers try to future-proof their setup is by installing a manifold off the return line that allows you to connect other gear in the future if/when needed:
I hope this helps and good luck!