More thoughts on building a Z-80 (64bit!!!)

You guys are really raining on my parade.... I have looked at Z180's, Z380's and etc.... They are SLOW!!!!!! The only availabe packaging for the Z380 is un-useable to me as a hobbist (without a lot of headache.) I hate the way that Zilog has taken the nice and simple control bus scheme of the Z-80 and really made it a pain-in-the-butt on the Z-380!. So, If some company would take the Z-bus (but with an (input/output) data size set of bus control lines), Z-80 instruction set and match a DEC Alpha performance (at a cheap price of-course), I would worship that company. (Oh yes, I want a 64bit data bus and a 128bit address bus). Is this asking for too much? Why can't we all just get along? Since this is a dream: My thoughts are this: If I can find some REALLY SIMPLE mirco-controllers that do just the basic microprocessor functions, I can parallel them to make them read-in and intrepret Z-80 code. I cannot see why massively populated microprocessors (like the PPC, Intel, and DEC Alpha) can reach clock speeds of 600 Mcyc and a really simple (one accumulator, bare instruction set) microcontroller can't exceed those speeds! If I got some of these micro-controllers and had two or three of them reading in instructions ahead of execution (looking for branches) I could do half of the job and speed up the through-put. Then use several more u-controllers acting in parallel to actually do the instruction execution. For math, a bunch of stinking fast memory locations acting as look-up tables. Any ideas?