I ordered a Marino (through the UK arm) first week in August, was told about 6 weeks.
Almost at 12 weeks now and it still isn’t in the UK.
I am not bothered, as it has given me plenty of time to buy the components for the full build, but I can imagine a 3 month wait would be irksome to some.
If you are keen to get it quickly, then consider something already in the UK (Marino UK do hold some stock occasionally, have you contacted them?) if you are wanting custom, then go for it.
I am 198cm tall and OTP XXL bikes require me to run loads of seat post, custom was the choice i made.