A friend asked me to perform at night he is organising. I looked at my current setup and thought..."hmm, this isn't going to work."

Right now I am very much studio bound : big mixer, outboard effects, a bunch of smaller devices, big old synth keyboard etc. However I think with some judicious additions I could manage with just the rack. Here is what I have currently:

ModularGrid Rack

How would you change it to make this into a stand-alone techno machine?

Guidelines :
* The rack is a Doepfer 6u 84hp suitcase which has been hacked. It has 6 spaces which can fit a 4hp module, three above the main rows, and three below. This is shown by the blue blind panels: these panels don't actually exist so you cannot replace them to make more space. Unfortunately the person who did the hacking did not do a great job so you cannot fit 2 x 2hp modules in one slot because the screw holes are not well enough aligned.
* Outside of the rack I will have a BeatStep Pro. I might also get an external compressor for the master bus (FMR RNLA, Oto Boum, something like that, suggestions welcome)
* Things which I currently use which I would like to replace are : various delays and reverbs and a Sherman Filterbank, which is usually used as a source of filth, not so much as a filter. Filth is quite important for the sound. And the mixer of course.
* I'm currently using these modules to make music and quite happy with them. I'd really rather not change them, partly for musical reasons, partly for cost reasons.
* I am not going to buy a bigger case.

So it's a pretty tall order, but how would you solve this problem?