Simon sometimes take longer time to reply. Are you using AliExpress to communicate with him?
If so, I’m sure he will reply soon. If he doesn’t reply in some days, gently send him another message re-asking what you asked before 
About ordering, I do it through AliExpress and pay through AliExpress system (Simon also accepts PayPal but I never payed through that mode). Also, take a look at this thread Convoy BLF Discount? .
What I normally do is to place the items I want to purchase in the shopping cart to see the prices, without completing the order or paying. Yet!
If you want a “customized” flashlight (implying change of drivers, emitter, rubber tailcap, …) send a message to Simon and ask him if it is possible to do those changes and if it will be necessary to adapt the price.
After he answers you (and if he agrees with the changes), you can place your order without paying.
When you place your order, you will probably have to mention on the Comments to the seller of each item which are the changes you want on that flashlight (driver, emitter, …). After placing the order send him a message again to let him know that you’ve done it.
If he needs to adjust the prices, ask him to send you a message after he does that adjustment, so you can finally pay and he can arrange shippment for your items.
Hope this helps ! :+1: