The house resembles your life. Moving house, resembles a change in your life. "Full of druggies" is referring to this forum.
Then I found a Rickenbacker bass guitar which I immediately picked up and started bashing out Lemmy bass riffs from his Hawkwind days
This is the interesting part of the dream. The way you express yourself through music, resembles the enjoyment you take from interacting and expressing yourself through bluelight. Lemmy resembles bluelight, he's a bit wayward and uses drugs which matches the ethos of the forum. Therefore, it's appropriate, that your enjoyment of using bluelight is approximated to your enjoyment of playing
his music.
This enjoyment of music is then further equated to the soul of Shambles.
"nice guitar, but the windings on your 4th & 3rd strings are fucked".
This is saying he's a decent guy, (not soulless, the guitar resembles soul) but a bit fucked up in areas. His 3rd and 4th strings symbolises areas of his psyche that have gone wrong.
The lawnmower resembles an external component to your life. Family for instance, is primary... the lawn mower is something secondary to you, like work, car, hobby or interest.
Essentially the dream is saying bluelight isn't quite fitting into your life, though you do enjoy using the site and it can have provide a spiritual benefit for you. It also sheds light onto the spirit of Shambles, which is alive and active, though is also inhibited in other areas.
. Physics in action!