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Those output low-pass transmit filters are 50 ohms and symetrical.
You could just borrow a filter design from some other rig that's suitable for 50 Watts of power.
Should be one filter per ham band as is typical. (You can cheat on 60m, 30m, 17m, 12m)

There may be other issues with uBitx documentation.
For example, perhaps some of those resistors in the PA need to be moderately beefy.
You will need tools to sweep that crystal filter and adjust impedances and cap values to suit
your carefully matched crystals.? The bandpass filter at L1,2,3,4 will also need to be carefully tuned.
There is no software yet available for a Raduino to drive it.

But if none of that sounds daunting, go for it.

Jerry, KE7ER

?
On Wed, Oct 4, 2017 at 08:07 am, Jerry Gaffke wrote:

You don't want to just copy that uBitx schematic and expect it to work properly.
Still under development.