Metric or inch mags is a function of which receiver you purchase. The magwell in the receiver ether has the larger "inch" forward lug recess machined into it, or the smaller metric punched tab recess. The "proper" receiver for the G1 would be the Type I which is only available from DSA these days. The Imbel is a type 3, which was the last version and lacks the lightening cuts as a cost saving measure. It will work fine, but is not "correct" for your kit.
Assembly basically consists of screwing the bbl into the new upper receiver and selecting/installing a locking shoulder. The "receiver wrench" can be as simple as wood blocks cut to closely fit the receiver contour or you can buy one. Bbl wrench is just a large adjustable or proper sized open end wrench. The trouble is "clocking" the bbl, or making sure it is perfectly timed when tight. If it screws into the 10:30-11:00 O-Clock position by hand it will usually be all right. If not, you have to use a shim washer or take metal off the shoulder to get it right. Low buck methods are available.
The locking shoulder selection begins with a barelled action. Strip the bolt and insert a GO guage in the chamber. A series of different sized guage rods or a stepped rod is inserted in the locking shoulder hole and then the bolt is inserted and lockup is attempted. Once the proper sized rod or step that allows firm pressure to achieve lockup, some simple math is done and the correct shoulder chosen. It is then pressed in. The rest of assembly is just advanced field stripping 101. Drillbit shanks and feeler guages can be substituted for actual guage rods if you go low buck.
That rifle does look refinished, most of the G1s wound up in Turkey after Germany went to the G3 and the Turks were almost as bad as the Yugoslavians when it came to rifle maintenance. IIRC, the factory finish was paint over park, or just park.
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