You're going to get some suggestions to get a bigger rack but I personally think this is an ok starting point, and you'd probably learn a lot (before you break down and do in fact get a bigger rack down the road). My one comment would be that I don't really see the need for the Lapsus Os here, you already have two attenuators on the Maths and that's 10HP you could instead use for other things, e.g.
1) a mini Marbles clone
2) a Turing Machine, either a 2HP TM or a mini Thonk one, alongside some extra modulation c.f. an Ochd, a Ladik Harmonic or Folding LFO, etc
3) another analog oscillator in small form factor like a Doepfer Precision VCO (4HP) plus some mixing or extra modulation as above
4) a Disting MK4 plus some combination of the above which'll let you try out a ton of new things and open up the possibilities for the rack a lot
my tunes: https://stevehand.bandcamp.com/