Phil i totally agree with you there!!!
And there are plenty of companies and people who would be willing to give you advise etc!!!
In all honesty most of the larger companies do not waste time and money on heated tanks - they just use a caustic tank with boiling water and caustic - and leave it to soak. But then they are probably doing the whole kitchen and it's equipment so can take 8-12 hours on the oven gradually rather than 1 or 2.
It's trial and error with taking all ovens aprt - yes they are all made differently and with different materials. However you do not want to be dismantling a machine and not being able to put it back together (the amount of times my partner was called out in the middle of the night because a technician who was highly trained couldn't put it back together- ha ha).
Honestly it's not all bad and if you think it's for you - GO FOR IT!