First up, unless you intended to spend a total of $750+ on the DFAM, take it out of the cab. Yes, that difference IS an average of the cost of the Eurorack recasing versus keeping it in its already-existing and already-powered case. Convenience is good, yes, but that's some expensive convenience. Also...if you put it back, you could theoretically go to a smaller/more portable Eurorack case for the remaining purposes. And given what Eurorack cases COST...
Next, Clouds. No. Discontinued years ago...so if you have to have the original, your only bet is the used market. A much better choice would be any of the Clouds clone versions built by third parties such as Codex Modulex, Michigan Synth Works, Tall Dog, et al. These also tend to be smaller, have expanded functions (see the Monsoon), or both.
Magneto. Not a bad choice, but it's big, and this build is small. If you go to a smaller Clouds clone, though, this might not be a problem. 4ms's Dual Looping Delay might be a better fit, however, at 20 hp and a few different tricks up its sleeve. Note also that both the Magneto and the DLD have insert points in their feedback paths, which allow you to add [INSERT FUN DEVICE HERE] into the feedback loop to alter subsequent repeats. So you might consider a VCF for this purpose. Even wackier, you could choose a VCF that also has an insert, this time in the resonance path...Doepfer's A-106-1 (a variant of the Korg MS-20 VCF set) comes to mind here. Then you can add another something into ITS insert...maybe a reverb...which screws with how the resonance behavior performs.
You need an input with an envelope follower for the Rhodes input to get the level up to modular levels and to provide amplitude tracking for anything else that might want it; Doepfer's A-119 would be perfect here, as would Sputnik's EF-Preamp (which also allows different input impedances). Then you'll also want modulation sources (another reason to remove the DFAM!) to screw around with the behavior of all of this. Lastly, you might consider some clock modulation modules/Boolean logic to mess with timing behavior between everything that needs a clock, such as the DFAM.
One other point: the reissued Model D has only instrument and line level audio I/O, so this will also have to be boosted/cut in order to get the levels from these up/down. Check Ladik's listings for suitable and cost-effective level conversion preamps.