Woldan:
This is marvellous stuff!
You will get so much more satisfaction taking game with a rifle you have "built" yourself.
I love the look of the commercial FN bolt shroud, and have fitted a couple to Mauser 98 sporters I have made up, including a .416 Taylor.
Only down-side is losing the sensible safety.

I feel compelled to caution against loading your mag from the bottom though: too easy for rounds to misalign or stack incorrectly. Check to see if your extractor claw will snap over a chambered round, it should on a commercial sporter. If so, it is better to top-load 4 rounds into the mag, then slide the 5th into the chamber. Press down the top round in the mag with your thumb until the bolt clears its rim, then close on the chambered round for 5 cartridges in the rifle.

If the extractor prevents the bolt from closing on a round already in the chamber, just bevel it to do so. There are probably YouTube videos showing how to do this, its not hard.

Good luck in your future hunting endeavours!