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I'll just post this for the sake of arguing (arguing on the internet... on zilvia... yeah right)
I don't think it is hard, i think it is really easy to overlook something simple, cut corners because of too much time spent / not enough money to buy quality tools / lack of knowledge and so on, and ending up with a 200 miles broken engine.
Thing is, the engines i usually see have a power output of 100HP/L at least, in oem form, and tend to be more on the 300-450HP/L when they get out of the shop. What i do know is that only one engine built by this shop has broken, and it was because the customer chose to bring a second hand block and mismatched block girdle (who would have thought about verifying that ... now they do). I also know that every car with a self assembled engine that comes in or out ends up (badly) broken.
Yes, the steps in themselves are not hard. Putting them together and being anal about everything is mandatory though, and usually skipped.
Now, thousands of $$$. sure, there is less labor by doing yourself, but parts are not free and neither are tools and machinists.
so specific tools, all gaskets, pistons, rods, bearings, surely crank from the look of it, oil pump, water pump, block control, cleaning, bore, hone, deck, head proofing and decking, valves & seats lap, maybe the clutch should be controled and changed while it is out and the flywheel surfaced, cracked exhaust manifold maybe too, various bolts and nuts ... Yes, that equals to thousands of $$$ in my book. It always had, and it always will be.
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