To me the first question when I see this rack is: what is connected to the FH-2? Depending on that answer the next question might be: do you really need the Usta in a rack of this size? If a DAW, an MPC or an Elektron device are controlling the FH-2, I'd rather get a CV expander for that and add one or two smaller sequencers. Something immediate and fun, like a Xaoc Tirana (or two). I don't see a mixer anywhere (except for the Links utility mixer). Are you planning to use an external mixer? If not, the Befaco STMix or an Intellijel Mixup are nice and compact. Also keep in mind, while the 4ms Ensemble Osc is really great, people aren't joking when they say it eats attenuators. If you don't want to dedicate half your FH-2 to it and control the EnOsc mostly externally (although that can absolutely make sense), I'd definitely recommend adding a triple/quad attenuator/attenuverter/vca solely for this module.
Here's my take on your rack using the Planar:
I've tried to keep as many of your choices intact as possible. For example, I'd also rather go with a Noise Engineering Pons Asinorum in place of the WMD Javelin. Two more envelopes + LFOs, but losing the accent input on the way. Lugia's suggestion of the Doepfer filter is a great one, although of course filters are a very personal thing. The Xaoc Samara can take over most of the MI Kinks + Links functions while providing more flexible mixing and attenuation.
For a rack of the size, I'd go with a Planar. It's a great performance tool but it's also great for exploring the possibilities of modules. One of the fastest methods to change up to six parameters at once in a controlled manner. Tetrapad is also a very good module (haven't tried the Tete, tbh), but in my opinion that combo is better suited to a three row rack. Or a very focused two rows.
I've arranged the sequencers to the top left 'cause I don't want wires covering the knobs. Same reason why I brought most "knobs on top" modules to the top row. Even if it means splitting the "filter section". I also prefer sprinkling attenuators and mixers in between other modules to keep cables short. I've only just noticed that I don't have a good idea how to best utilize the Bitbox in this rack, so I maybe this is where my whole plan comes crashing down :D Anyway, hope this all kind of made sense and maybe has been of help in some way.
Edit: you've got two stereo modules but no stereo filters(s). Or at least two identical filters. Maybe that Doepfer module should be exchanged for something else, after all. The 12hp would fit a WMD Overseer (stereo) + a mono Electrosmith 2144 LPF - the latter should even get you close to the character of the Tiptop 2040 :)
You don't need a (stereo) filter for the Ensemble Oscillator, but having one can be really nice, especially for pads.