Well done! That'll work fine. What's nice is your filter tray is now far from the bulb. Normally it sits about 5cm from the bulb, which in my case is a 200 watt large bulb for the Durst 138. I found a Durst heat absorbing glass that sits between the lamphouse and the mirror house. And I built a small fan inside the lamphouse's hole for the Durst ventilator. That works.
The L1000 is a wonderful basic enlarger. I do large prints and found the Durst wall mount which changes a lot the possibilities of this enlarger.