It is amazing how well the stanley hinge works. The only thing I would like to own is a injection pump plug because my improvised ones are always slightly loose, and a timing gauge obv.
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11mm craftsmen 1/4 drive socket fits like a glove.
I have timed over 3 dozen engines with my prothe timing tools..
They are just fine.. the actual gauge part of the process does not have to be spot on precise within a thousandth of an inch.. many people time these by ear remember. If you line up all the marks it will run, probably pretty good too.. And this is without using the dial gauge at all yet.
so in summary, Prothes tools will do just fine. Plus you only need the gauge, save some money 
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i found a guy selling a set on vortex all 4 pieces 48 bucks shipped. i have timed by ear before and it worked well. i want to at least try doing it by the book once just to compare.
I have a piece of tool steel that I use for a cam lock. It's slightly loose so I make up the difference with a feeler gauge. Been using a 5/8-20 bolt for the IP lock and it's fairly tight. Assembled the block to the trans and used a dial indicator for TDC. Dead nuts was the pointer on the right edge of the 0. Looks like the flywheel markings are reasonably accurate.