Dayton RS180-8 & Vifa XT25, what would you do?

One of our regulars is Michael Chua, who seems to have done quite a few Dayton RS-180s projects. This is the shielded version, but can't be much different:

Raven – Dayton RS-180s with Peerless XT25TG30-04 – AmpsLab

There are two versions of the XT25. The double-magnet and louder 60 is considered better than the 30.

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Michael will send you a schematic if you PM him. I would think the box is a moveable feast.

I noticed that the XT25's on the way are the 8ohm version(and the 30 version), I'm sure that means some filter re-design, but I don't really know how. The last speakers I built was over 10 years ago and OB with Dayton 15" IB, RS180S-8 and B&G Neo8.
Now I have a 3yo and OB's aren't really suitable for curious fingers, that and one of the Neo8's developed a humm, I know it's the driver as I swapped channels and filter parts.

Anyone with tips on speaker design software for Linux? Using Win10 on the desktop...but I really prefer working in GNU/Linux and preferably without the need for wine.