I did that, too, but not the entire Kreuzer thingy. I´ve been using the three transistor frontend without EQ and added a 3 band swinging input EQ based on the API553 circuit. It serves me well up to today. I´ve tailored the EQ frequencies to match with my Wal fretless.
I totally get the two input feature but I´d like to see two seperate input gains and EQs come with it. I´m playing fretted and fretless and both basses need different EQ settings to work together in the band.
Last week I ran into a dirt cheap Eden 410XLT and used it rightaway at our gig. Happy camper, what a great cab. It´s extremely loud and cuts through very well.
Over here it looks like this:
The basscab contains a JBL K140 speaker. The amping is a selfmade Basspreamp (FET preamp similar to Trace Elliot into a modified API 553 EQ circuit) and a KMT DC5 poweramp. The Ampeg Jet is used for my piano (late 70s Yamaha CP30).
Rush was my bass bible for quite some time. Geddy´s playing is so unusual, inventive, full of character and unusual ideas. Very refreshing. Many hyped bassplayers have less to say than Geddy.
Sorry, still a fanboy after 40 years.