Thanks to the threads and pictures posted by several great people here, especially Alkraut and Roncallo, I'm nearly ready to finish my timing chain guides replacement and put in a new chain. By 'ready', I mean getting up the nerve to remove the distributor and do the driver side upper guides. The passenger side guide was easy, but I'm a bit worried about removing the chain sprocket to do the left side.
Anyway, I decided to make my own chain loader tool, dimensions copied/estimated from pictures of the actual unit available from U.S. sources for about $52.00 + about $30.00 more for shipping and duty/taxes etc. to Canada.
Besides the high price for a one-time use tool, I didn't like the way it mounts to the front camshaft bearing carrier bolts. I was worried about disturbing the torque settings and/or mis-alignment of the bearing to the cam when replacing the bolts after finishing doing the chain job. I suspect it is designed to be used on either the left or right head, but all the threads on putting on a new chain have it used on the right one only, so I thought I'd just custom make it to use there.
I took my best guess as to the actual sizing of the 'covering' piece that goes over the chain/sprocket and did up a cardboard pattern. I taped cardboard on the inside of the curved top to get a little over 1/16" clearance from the chain/sprocket, checked for fitment, then disassembled and traced the pattern on some steel scrap, just over 1/16" thick.
After tackwelding the cover piece together, I transferred the spacing cardboard from the mockup to the steel piece, then set it on the sprocket. I made a piece of angle with 2 holes to mount to the alternator bracket holes in the head, then did the uprights to connect them together.

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1986 560SL
2002 Toyota Camry
1993 Lexus