Hi Elton,
WOW !!
Now we totally understand that you haven't done a factory look restoration, but that's up to the individual and I feel the result is really superb and we here at the ODK are grateful that you have documented this rebuild from start to finish on our forum.
Re-plating things like handle bars, nuts and bolts etc. is quite expensive and I can appreciate that this just blows the cost of the mower out unbelievably. You'll find that the newer style sloper Briggs motor (similar to Honda) is a vast improvement (vibration wise) over the upright older versions and thus this will be much kinder on the chassis rails.
One thing I will have to strongly comment on though is the reel and bed knife set up which in your case is incorrect. You have chosen the non contact method which is not as per Scott Bonnar's recommendation.
You should set up the reel so that you have the slightest contact between the the two surfaces just like a pair of scissors and thus it would cut paper. This method is a self sharpening process while the non contact method will within a short time gum up the edges of the reel blades and reduce the cutting efficiency rapidly. You'll end up having the blades tear the grass rather than cut it.
Look at the section titled "Cutter Setting" under the following document.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=58198#Post58198 Apart from this minor issue which you can solve in minutes you've come up with a marvelous result which will last you a lifetime and I'm sure will have many of your neighbours asking you endless amounts of positive questions.

Cheers,
BB.
PS. The Red plastic plug is no longer available from our online store but is still available from the following seller on eBay that seems to have cornered the market with this item, but it will most definitely put a nice finishing touch on your machine.
http://www.ebay.com.au/itm/Scott-bonnar-model-45-side-cover-plug-/131809122797?hash=item1eb06f99ed:g:JOQAAOSwubRXDeRj