That £450 metal box wouldnt fit 4 bikes in it. They also scream out that you have nice bikes, as opposed to a shed that might have a nice bike in it or maybe just a load of junk.
How much are those Beastsheds? That is all stuff you can do after market too, quite cheaply and easily.
Ive altered my shed to be very similar to the beast ones, but also secured the roof to the walls better.
The bikes are now stored in side the shed inside filling cabinets (you can battered old ones on ebay relatively cheaply)
I have a PIR alarm inside too.
Ive 2 attempts on the shed in the last year or so. Once the alarm scared them off, 2nd time they gave up trying to get the door open
There was a thread on here last week/week before where some one had bought a PIR and the siren could be remotely placed. ie in their bedroom.
Thats the ideal for me. The buggers will get in if they want to but great if you can be alerted without them knowing. When my alarm went off, by the time I had woken up, called the Police they were long gone (empty handed). Would have been great to have known they were there, get the Police, and great them as they walked out with the bikes, or trying to get the bikes..