You forgot to mention using a trusted forum escrow here to safely hold the 11 Litecoins while you ship this rig to the buyer. Here is a list of escrows why will happily make this a safe transaction:
https://bitcointalk.org/index.php?topic=2439910.0You will accept escrow, right? Or am I correct to assume you have something else in mind?
Brand new account so I’m sure you understand that there will be no sending payment first. Not even incrementally. By that I mean not even half first and half after delivery of the rig. Not even 1 LTC first. Using a trusted forum escrow is the safest and only way forward with this deal.