SendCutSend instructions for getting metal mount created

Since I've never used SendCutSend before, it'd be nice to have a step-by-step set of instructions for ordering the 2U faceplate in metal from them (mostly what options to choose), and notes about potential costs and shipping times.

(There is no rush to do this of course!)

Separately, maybe someone in the community would like to organize a group buy? Logistics mostly kill that sort of thing, but if multiple people in one small region might want metal parts, it would save money to have one person order multiples, then distribute them locally.

And with flat 10" parts, shipping costs aren't that bad.

まず、2U フェースプレートに関するリポジトリの既存ドキュメントと、SendCutSend に関する現在の案内を確認します。注文オプション、発生する可能性のある費用、発送期間、および明確にサポートされている共同購入に関する注意事項を記録します。読者が金属部品を注文する手順に従える状態になれば、作業は完了です。

索引モデルが issue の本文から書いたものです。