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:
This is our ezBuild Dual Filter Sock Holder 5 Chamber Sump/Refugium Ultimate baffle kit for 20 gallon Long Aqueon® or Imagitarium™ glass tanks with adjustable water depth. Our exclusive ezBuild sump kits are the fastest and easiest way to convert a glass aquarium to a fully functional sump.
www.ebay.com
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!