Re: Vehicle Engineering,,tricks the designers play
It does seem at times these things are designed not for the home mechanic, but to be fair to the various designers involved, mostly it is done for 1: Profit on the vehicle itself by making it easy (cheap) to put together on the production line & 2: a more attractive purchase for the customer.
Unfortunately, clever design modeling coupled with transverse engine layouts means the 'packaging' under a bonnet these days can be made very tight, this is great because the customer is happy, he/she has all the mod cons and performance stuffed into an engine bay that doesn't take up (relatively speaking) much room. The downside of course, it can be a nightmare to take anything apart again in service (Even garage tech's must hate some of these job's).
As for Toyota, they are masters of efficient manufacture, and for many, the benchmark which they aspire to.