I found this last night on motor-talk.de:
Quote:
From mini cooper electrohydraulic masking control (hydraulic pump, hose and damper)
- Tightening assistance from audi a8 4e
- And few relays and 2 timers (1 Relai for the term of the pump and the other for the scheduled opening of the original
kofferaumöffners)
- A stromstoßrelai (for polarity change of pump)
- Push buttons in the mark trough 4e from audi a8 (so you also kofferraum the on gets when you stand in front because I look so, this stupid, thick, silver closed in the tail light off made have  )
1. Safety: you have the circuit course so build the pump only going places when the heckklapenschloss has actually taken on, otherwise you press the damper everything kapputt!
2. Safety: -Would a motor overload cut-off (I'm degree turn but is not so easy ... so for me  )
-hydraulic pressure switch (I'm degree turn but is not so easy ... so for me )
3. safety - the whole system to be connected to the rear sensors of the parking aid, ie is there is an impediment that does not flap on
the move the whole runs also zeitrelai but the pump immediately ceases as soon as the closing tap in the locks and then the closing aid comes to use and pulls the lid again a piece down, in the seal purely
all done without closure assistants, only there where the dampers are attached to the tailgate create it not (by the angle) the flap to draw properly (this was my first attempt ... video 1)
tja and the cost now comes naturally gets it to where her set hydraulics from minicooper ago, but it go other Set`s, eg eos or Opel, my set has cost 50 Euronen
to: - audi a8 4e closing aid in the auktionshaus ca 20 euro
- Audi a8 4e tailgate pushbutton (external) ca 20 euro
- 2 timers in electro market 19 euro
- Stromstoßrelai approx 4 Euro I, I'd be .... yes fummel happy with something 
- Relay and small things such as screws, etc.
- And for the driver, the not so knowledgeable about things NEN electrician fire extinguisher, think 20 euro
is a little work, my colleagues laugh immmer when I start to build with, but I have fun at something, and if it is then works first the class yet, and internally then all think ... oh I would have also liked
Incidentally, the plug of the push buttons in the mark iris need her to ZV pump! because you want the car boot not be able to open when the vehicle is locked
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The struts appear to be from a Mini R59:
Vauxhall Tigra struts look very similar but a bit too long.
Control logic should be fairly straighforward. A microcontroller like an Arduino might work quite nicely, or just do it with relays and diodes
It should work fine with the standard remote too, rather than needing that whole keyless go setup. It is quite slick, but I don't like not being able to turn the ignition on separately. I'm sure thats fairly straightforward to sort (short press ignition on, long press start) but not as high on my priorities as a glorious power bootlid!