Doorwin ali ndi mwayi wopereka mtengo wabwino kwambiri pamawindo a aluminiyamu amatabwa.Tikufuna kupanga zinthu zolimba, zosagwiritsa ntchito mphamvu komanso zokongola kuti zizipezeka mu bajeti zonse.Timayesetsa kupereka chithandizo chabwino kwambiri chamakasitomala ndi gulu lodzipatulira lopanga ndi uinjiniya wama projekiti achikhalidwe komanso gulu lamalonda laluso lomwe limayankha mwachangu mafunso.