Here it is! The hybrid of BuildCraft and RedPower is here. This is a major redesign of my previous reactor. It is practically same efficiency, but due too bug in BC the effect of withdrawing buckets aren't as good as in previous reactor(A partial redesign fix applied to reactor, but it isn't perfect)
Updated!
New version uses less bucket fillers!
Now it even less expensive!
Mods in use:
BuildCraft 2.2.5
RedPower 2 Pre-Release 3b All modules
Additional Pipes Rev 27
As previous design it is extremely efficient and don't need cool down time.
But it is also way cheaper to make (which gives a huge advantage).
How does it work!?
It consist of simple refilling system with timing and slight delay system to take out filled buckets.
The design are relatively simple and effective.
Feel free to recreate, just give me a credit of original design.
Advantages over previous design:
Cheaper to make.
Takes less space.
Need less refilling stations.
Disadvantages over previous design:
Needs extra mods.
Sometimes dupes buckets. (For me this is disadvantage)
Pictures
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Click picture to see bigger version.
Reactor view
The View of 2 designs together. (Compare the size)
Updated Version
Schematics file will be supplied soon.
I would like to discuss this reactor here. I really like improvements with using RP2, but it also needs a RP2 which is opposite to improvements in some way.
Some notes:
Reactor smaller in all dimensions to previous model.
Sometimes buckets getting duped, it can be annoying, since it look like they poped out and system lost some of them.
This reactor uses less buckets.
I will add control room later.
Schematics installation instructions
Display Spoiler
DON'T USE WorldEdit at all, it will brake all redpower and your legs.
Use WorldEdit (Latest version preferred)
Back up world, if it have any importances to you.
Paste in single chunk
Turn bucket return switch off(it is on in schematics) to close system, so buckets staying there.
Put buckets in to system, by turning on chest pumps, it will take some time for buckets to come in to system, wait around one minute.
Turn off chest pumps.
Turn on timer circuit.
Turn on reactor.
Enjoy your power 
I am happy to discuss this reactor.
Have a question? Don't be shy to ask.
