Using the the 1/16 x 1 inch aluminum or steel flat stock.
6-3/4 inch - servo mount
2 1/8 inch - backing plate
two 3-1/2 inch - risers
3/16 inch holes
Tape or clamp the above pieces to some old wood and drill all holes (3/16 inches) before bending. It is easier to drill first. All the holes will line up.
The only holes that are important are the pairs on the end of the long servo mount. To mark them, just push them in along the end of the servo under the mounting holes and mark with a pen. Do this on both ends.
The other holes just need to be roughly aligned as you see them in the picture.
love to pound on metal with hammers to form it into something.
The long servo mount needs to be bent into a "C" shape to match the servo. If you used a similar servo, then the small end bends need to both be at 1/2 inch and the other two bends need to be at 2 inches (1-1/2 inches long) leaving 2-3/4 across the bottom.
The two 3-1/2 inch risers need to be bent at 2 inches from the connection to the servo bracket.
Kids also enjoy putting all the parts together and especially crawling inside the kennel. If the dog goes in too, all the more fun.
Connect the risers to the servo bracket and then connect the servo. It has to be done in this order so you can tighten the riser bolts before you mount the servo. Last, mount the whole assembly to the kennel door by placing the backing plate on the inside and the servo assembly on the outside. Align the servo so it is centered over the latch cover.