Glad to inspire you

I’m very tempted too.
I acquired the Planetsrike supplement to have a closer look at one and it’s looking great. I have no idea of mainstream GW pricing these days but a browse of the rumours thread I saw the photos in suggests £50. It is a really massive kit though and looking at the shot from above you get 12 of those nice eagle wall section pieces.
Personally I’ll leave the skulls on the base of the tower, they’re nicely modelled for GW skulls and are a good twice the size of a W40k model’s skull so they’re clearly not just something from W40k you’ve not bothered removing. If you paint them gold or stone rather than actually boney colour it’d help too. I will loose the triangular shapes with skulls in atop the lower wall sections as those look naff. Defence laser could be cool (alternatively an observatory with a telescope could be an alternative use), I think I’d convert or change the weapons though, probably to still something lasery but something that doesn’t stand out a mile as being a W40k lascanon.
Interestingly one side has the lascanon defence turret, while the other has recessed missile silo with a circle of missile tubes and a retracting roof-cover. The missiles are around the same size as the ones on the Guard vehicle so I’m looking at it and musing on the possible conversion of one to a Krieg Deathstrike silo.