How do you make a saradomin platebody in Runescape

God-trimmed Rune armour cannot be player-made. All God-trimmed Rune armours are possible rewards from Treasure Trails, which sell for varying amounts of money in the Grand Exchange or through street price. Players offering to "make" God-trimmed Rune armour are scammers, who will steal whatever you give them -- this is a very old scam. Be cautious and don't fall for it.