Rich,
Welcome to ALR. There are a lot of "old guys", myself included, here and many have hard-won opinions.
Build the rifle you want! So what rifle do your want? Jaeger guns were NOT chubby. Like Mike has so eloquently stated they were built around robust components.
I would take issue with the notion that a nose cap is merely decorative. Many of my friends are historical trekkers and spent weeks in the woods recreating the life of the 18th century. Rifles take a bit of a beating on a trek! One of my friends came back with a rifle whose stock was split from the muzzle down to the entry pipe as a result of a fall where his rifle hit a log mashing the ramrod into the stock, toward the barrel. The rifle had been built without a fore-end cap. I was able to repair the stock with carbon fiber and glue and made a fore-end cap to stabilize the stock. The rifle is still going strong 10 years later. I had a similar repair to do on a fowler. It, too got a fore-end cap. When you look at a fore-stock it has a thin web of wood, running along the grain, between ramrod groove and barrel with numerous holes through it. It is very weak without a fore-end cap. We don't know how many original rifles were broken along the fore stock and had to be restocked. But my experience suggests quite a few.
Likewise for toe-plates, they strengthen the toe of the butt. I'm just a hobby builder but I have repaired 5 different broken stocks, one twice due to two separate falls, due to falls which chipped out the toe of the butt-stock. All were guns without a toe-plates. The screw that holds the toe plate on strengthens the stock immensely in that inherently weak area.
So, what you incorporate into your rifle gun should be governed by how you intend to use it.
Best Regards,
John Cholin