A little more progress made. I have mounted the projector to the frame.
Washers 18mm x 1mm M6 - 10pcs.
Socket wrench + 10mm socket.
Screwdriver ( No, not the one with the Orange Juice! It is too early to drink! ) depending on the M3 bolt heads.
M3 x 25mm bolts - 3pcs.
M6x20mm bolts - 3pcs.
Standoffs - 18mm x M4 - 3pcs.
For the purpose I dug up an old aluminum heat sink (120mm X 150mm) , but you can use an aluminum flat piece 4mm thick and with a proper size for your projector mounting holes. Disregard the 90 Degree bend.
The easiest way ( since projector manufacturers do not provide you with a bolt pattern like water heater manufacturers do) to create and transfer the mounting hole location is on a piece of paper. Mark the hole locations and attach with tape to plate ( after you center it, of course ), and drill the holes ( in my case on the 5100MP they are 3mm ) a little bigger ( 3.2mm ) than the bolts to be used. Check for fit. Check that no vent or air holes are blocked ( read further below and you will see ).
Then drill holes for the bracket to frame bolts 6mm ( similarly a little bigger that the bolt size 6.2mm).
As in the post about the Power supply, get more washers than just needed ( these are also 18mm, but for the M6 bolts ) and M6x20mm bolts.
I used 3 M6 in a horizontal pattern - did not follow some specific distance between them, just two near the end and one in the middle.
As seen I had to add spacers, because the mounting plate covered a vent hole on the bottom of the projector and also to clear the washers and nuts used to mount the plate to the frame.
I had to also countersink the M3 x 25mm bolts a little(2mm)with a 5mm drill bit, so they screw in further in the projector frame and I have a more secure projector-plate connection.
And the end result looks like this:
Nicely done! Now you can get that screwdriver with Absolute.